blocks|key|224332|text|Base-64编码是一种将二进制数据转换为文本的方式，这样就可以更容易地在电子邮件和HTML表单数据中传输。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|224333|http://en.wikipedia.org/wiki/Base64|offset|length|224334|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|Z|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@$D|O|E|P|1|Q]]|A|$]]|$1|F|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|C]]]]

Base-64 encoding is a way of taking binary data and turning it into text so that it's more easily transmitted in things like e-mail and HTML form data.

<a href="http://en.wikipedia.org/wiki/Base64" rel="noreferrer">http://en.wikipedia.org/wiki/Base64</a>

blocks|key|1223570|text|大多数情况下，我看到它用于在只能处理ascii或简单字符集的上下文中编码二进制数据。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1223571|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Mostly, I've seen it used to encode binary data in contexts that can only handle ascii - or a simple - character sets.

blocks|key|224354|text|它用于将任意二进制数据转换为ASCII文本。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|224355|例如，电子邮件附件就是这样发送的.|224356|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

It's used for converting arbitrary binary data to ASCII text.

For example, e-mail attachments are sent this way.

blocks|key|874484|text|它基本上是一种在ASCII文本中编码任意二进制数据的方法。它需要4个字符的每3个字节的数据，加上潜在的一点填充在末尾。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|874485|基本上，输入的每6位都是用64个字符的字母表编码的.“标准”字母表使用as、as、0-9和%2B和/，并以=作为填充字符。有URL安全的变体。|874486|维基百科是一个相当好的更多信息的来源。|offset|length|874487|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Base64^0|0|0|0|4|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@$F|S|G|T|1|U]]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

It's basically a way of encoding arbitrary binary data in ASCII text. It takes 4 characters per 3 bytes of data, plus potentially a bit of padding at the end.

Essentially each 6 bits of the input is encoded in a 64-character alphabet. The "standard" alphabet uses A-Z, a-z, 0-9 and + and /, with = as a padding character. There are URL-safe variants.

<a href="http://en.wikipedia.org/wiki/Base64" rel="noreferrer">Wikipedia</a> is a reasonably good source of more information.

blocks|key|224415|text|有些传输协议只允许发送字母数字字符。想象一下，控制字符被用来触发特殊操作和/或只支持每个字符的有限位宽度的情况。Base64将任何输入转换为只使用字母数字字符、%2B、/和=作为填充字符的编码。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|224416|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Base64^0|28|1|2A|1|2C|1|1K|6|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]|$9|Q|A|R|B|C]|$9|S|A|T|B|C]]|D|@$9|U|A|V|1|W]]|E|$]]|$1|F|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

Some transportation protocols only allow alphanumerical characters to be transmitted. Just imagine a situation where control characters are used to trigger special actions and/or that only supports a limited bit width per character. <a href="http://en.wikipedia.org/wiki/Base64" rel="noreferrer">Base64</a> transforms any input into an encoding that only uses alphanumeric characters, <code>+</code>, <code>/</code> and the <code>=</code> as a padding character.

blocks|key|879063|text|就布拉德所说的话做一些扩展:电子邮件和Usenet的许多传输机制以及其他移动数据的方式都不是"8位干净“，这意味着标准ascii字符集之外的字符在传输过程中可能会出现故障--例如，0x0D可能被看作是回车，然后变成回车和行馈。基64将所有二进制字符映射到几个标准的ascii字母、数字和标点符号中，这样就不会损坏它们。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|879064|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

To expand a bit on what Brad is saying: many transport mechanisms for email and Usenet and other ways of moving data are not "8 bit clean", which means that characters outside the standard ascii character set might be mangled in transit - for instance, 0x0D might be seen as a carriage return, and turned into a carriage return and line feed. Base 64 maps all the binary characters into several standard ascii letters and numbers and punctuation so they won't be mangled this way.

blocks|key|879082|text|来自http://en.wikipedia.org/wiki/Base64|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|879083|术语Base64是指特定的MIME内容传输编码。它还被用作对二进制数据进行编码的任何类似编码方案的通用术语，方法是对二进制数据进行数字处理并将其转换为基本的64表示形式。基础的特殊选择是由于字符集编码的历史:可以选择一组64个字符，这些字符既是大多数编码所共有的子集的一部分，也是可打印的。这种组合使得数据不太可能通过电子邮件等系统在传输过程中被修改，而电子邮件传统上是不干净的。
Base64可以在各种上下文中使用：|blockquote|879084|进化与雷鸟利用Base64混淆电子邮件passwords1|unordered-list-item|879085|Base64可用于传输和存储可能导致分隔符冲突的文本。|879086|Base64通常被用作一种快速但不安全的快捷方式，可以在不引起密码密钥管理开销的情况下掩盖秘密。|879087|垃圾邮件发送者使用Base64来规避基本的反垃圾邮件工具，这些工具通常不解码Base64，因此无法检测编码消息中的关键字。|879088|Base64用于在LDIF文件中编码字符串。|879089|Base64有时用于在XML文件中嵌入二进制数据，使用类似于.例如火狐的bookmarks.html。|879090|在与政府财政签名打印设备(通常是通过串口或并行口)通信时，Base64也被使用，以最大限度地减少传输用于签名的收据字符的延迟。|879091|Base64用于在脚本中对二进制文件(如图像)进行编码，以避免依赖外部文件。|879092|可用于将原始图像数据嵌入到CSS属性(如背景图像)中。|879093|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Base64^0|2|Z|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|17|8|@]|9|@$A|18|B|19|1|1A]]|C|$]]|$1|D|3|E|5|F|7|1B|8|@]|9|@]|C|$]]|$1|G|3|H|5|I|7|1C|8|@]|9|@]|C|$]]|$1|J|3|K|5|I|7|1D|8|@]|9|@]|C|$]]|$1|L|3|M|5|I|7|1E|8|@]|9|@]|C|$]]|$1|N|3|O|5|I|7|1F|8|@]|9|@]|C|$]]|$1|P|3|Q|5|I|7|1G|8|@]|9|@]|C|$]]|$1|R|3|S|5|I|7|1H|8|@]|9|@]|C|$]]|$1|T|3|U|5|I|7|1I|8|@]|9|@]|C|$]]|$1|V|3|W|5|I|7|1J|8|@]|9|@]|C|$]]|$1|X|3|Y|5|I|7|1K|8|@]|9|@]|C|$]]|$1|Z|3|-4|5|6|7|1L|8|@]|9|@]|C|$]]]|10|$11|$5|12|13|14|C|$15|16]]]]

From <a href="http://en.wikipedia.org/wiki/Base64" rel="noreferrer">http://en.wikipedia.org/wiki/Base64</a> 

<blockquote>
 The term Base64 refers to a specific MIME content transfer encoding.
 It is also used as a generic term for any similar encoding scheme that
 encodes binary data by treating it numerically and translating it into
 a base 64 representation. The particular choice of base is due to the
 history of character set encoding: one can choose a set of 64
 characters that is both part of the subset common to most encodings,
 and also printable. This combination leaves the data unlikely to be
 modified in transit through systems, such as email, which were
 traditionally not 8-bit clean.
 
 Base64 can be used in a variety of contexts: 
 
 <ul>
 <li>Evolution and Thunderbird use Base64 to obfuscate e-mail passwords[1] </li>
 <li>Base64 can be used to transmit and store text that might otherwise cause delimiter collision </li>
 <li>Base64 is often used as a quick but insecure shortcut to obscure secrets without incurring the overhead of cryptographic key management</li>
 <li>Spammers use Base64 to evade basic anti-spamming tools, which often do not decode Base64 and therefore cannot detect keywords in encoded
 messages. </li>
 <li>Base64 is used to encode character strings in LDIF files </li>
 <li>Base64 is sometimes used to embed binary data in an XML file, using a syntax similar to ...... e.g.
 Firefox's bookmarks.html. </li>
 <li>Base64 is also used when communicating with government Fiscal Signature printing devices (usually, over serial or parallel ports) to
 minimize the delay when transferring receipt characters for signing. </li>
 <li>Base64 is used to encode binary files such as images within scripts, to avoid depending on external files. </li>
 <li>Can be used to embed raw image data into a CSS property such as background-image.</li>
 </ul>
</blockquote>

blocks|key|1223886|text|当您有一些想要通过网络传送的二进制数据时，通常不会通过以原始格式在线路上传输比特和字节来实现。为什么？因为有些媒体是为流文本而制作的。您永远不知道--有些协议可能会将二进制数据解释为控制字符(如调制解调器)，或者您的二进制数据可能会被搞砸，因为底层协议可能会认为您输入了一个特殊的字符组合(比如FTP如何翻译行尾)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1223887|为了解决这个问题，人们将二进制数据编码成字符。Base64是这些编码类型之一。|1223888|为什么是64?|offset|length|style|BOLD|1223889|因为您通常可以依赖许多字符集中存在的相同的64个字符，并且您可以合理地确信您的数据将在线路的另一端不损坏。|1223890|entityMap^0|0|0|0|7|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|P|8|@$F|Q|G|R|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|S|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|M|$]]

When you have some binary data that you want to ship across a network, you generally don't do it by just streaming the bits and bytes over the wire in a raw format. Why? because some media are made for streaming text. You never know -- some protocols may interpret your binary data as control characters (like a modem), or your binary data could be screwed up because the underlying protocol might think that you've entered a special character combination (like how FTP translates line endings). 

So to get around this, people encode the binary data into characters. Base64 is one of these types of encodings. 

Why 64? 
Because you can generally rely on the same 64 characters being present in many character sets, and you can be reasonably confident that your data's going to end up on the other side of the wire uncorrupted.

blocks|key|879116|text|它是二进制数据的文本编码，结果文本只有字母、数字和符号"%2B“、"/”和"=“。它是一种在专门用于文本数据的媒体上存储/传输二进制数据的方便方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|879117|但为什么是-64基地？将二进制数据转换为文本的两个备选方案是：|879118|十进制:将每个字节的十进制值存储为三个数字:+045、112、101、037等，其中每个字节由3个字节表示。数据膨胀了三倍。|ordered-list-item|879119|十六进制:将字节存储为十六进制对:+AC+470D1A等，其中每个字节由2个字节表示。数据膨胀了两倍。|879120|基-64映射3个字节(8x3=+24位)的4个字符，跨越6位(6x4=+24位)。结果看起来像是“TWFuIGlzIGRpc3Rpb.”。因此，膨胀仅为原来的4/3+=+1.3333333倍。|879121|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|P|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|Q|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|L|$]]

It's a textual encoding of binary data where the resultant text has nothing but letters, numbers and the symbols "+", "/" and "=". It's a convenient way to store/transmit binary data over media that is specifically used for textual data.

But why Base-64? The two alternatives for converting binary data into text that immediately spring to mind are:

<ol>
<li>Decimal: store the decimal value of each byte as three numbers: 045 112 101 037 etc. where each byte is represented by 3 bytes. The data bloats three-fold.</li>
<li>Hexadecimal: store the bytes as hex pairs: AC 47 0D 1A etc. where each byte is represented by 2 bytes. The data bloats two-fold.</li>
</ol>

Base-64 maps 3 bytes (8 x 3 = 24 bits) in 4 characters that span 6-bits (6 x 4 = 24 bits). The result looks something like "TWFuIGlzIGRpc3Rpb...". Therefore the bloating is only a mere 4/3 = 1.3333333 times the original.

blocks|key|224678|text|在计算机的早期，当电话线系统间通信不特别可靠时，使用了一种快速而肮脏的方法来验证数据完整性：“位奇偶”。在这种方法中，传输的每一个字节都有7位的数据，第8位是1或0，迫使字节中1位的总数为偶数。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|224679|因此0x01将被传输为0x81；0x02将是0x82；0x03将保持0x03，等等。|224680|为了进一步推进该系统，在定义ASCII字符集时，只分配了00-7F字符。(今天，所有在80-FF范围内的字符都是非标准的)|224681|当时的许多路由器将奇偶校验和字节转换成硬件，迫使连接到它们的计算机严格处理7位数据。这迫使电子邮件附件(以及所有其他数据，这就是为什么HTTP和SMTP协议是基于文本的)转换为纯文本格式。|224682|很少有路由器能活到90年代。我非常怀疑他们中的任何一个今天还在使用。|224683|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|N|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|O|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

In the early days of computers, when telephone line inter-system communication was not particularly reliable, a quick &amp; dirty method of verifying data integrity was used: "bit parity". In this method, every byte transmitted would have 7-bits of data, and the 8th would be 1 or 0, to force the total number of 1 bits in the byte to be even. 

Hence 0x01 would be transmited as 0x81; 0x02 would be 0x82; 0x03 would remain 0x03 etc.

To further this system, when the ASCII character set was defined, only 00-7F were assigned characters. (Still today, all characters set in the range 80-FF are non-standard)

Many routers of the day put the parity check and byte translation into hardware, forcing the computers attached to them to deal strictly with 7-bit data. This force email attachments (and all other data, which is why HTTP &amp; SMTP protocols are text-based), to be convert into a text-only format.

Few of the routers survived into the 90s. I severely doubt any of them are in use today.

blocks|key|874623|text|当我们通过web服务传输大型二进制对象(图像)时，我在实际意义上使用它。因此，当我使用python测试C#+web服务时，可以使用一些魔法重新创建二进制对象。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|874624|巨蟒|874625|import+base64
imageAsBytes+=+base64.b64decode(+dataFromWS+)|code-block|syntax|javascript|874626|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I use it in a practical sense when we transfer large binary objects (images) via web services. So when I am testing a C# web service using a python script, the binary object can be recreated with a little magic. 

[In python]

<pre><code>import base64
imageAsBytes = base64.b64decode( dataFromWS )
</code></pre>

blocks|key|224744|text|除了已经说过的，两个非常常见的用途还没有被列出|type|unstyled|depth|inlineStyleRanges|entityRanges|data|224745|散列：|offset|length|style|BOLD|224746|散列是单向函数，它将一个字节块转换为另一个固定大小的字节块，例如128位或256位(SHA/MD5)。将得到的字节转换为Base64可以更容易地显示哈希，特别是在比较校验和以确保完整性时。散列在Base64中非常常见，以至于许多人将Base64本身误认为是一个散列。|224747|密码学：|224748|由于加密密钥不一定是文本，而是原始字节，因此有时需要将其存储在文件或数据库中，Base64对此非常方便。与结果的加密字节相同。|224749|请注意，虽然Base64经常用于加密，但它并不是一种安全机制。任何人都可以将Base64字符串转换回其原始字节，因此不应将其用作保护数据的手段，只应用作更容易地显示或存储原始字节的格式。|224750|证书|224751|PEM格式的x509证书是以64为基编码的。档案/|224752|entityMap|0|LINK|mutability|MUTABLE|url|http://how2ssl.com/articles/working_with_pem_files/^0|0|0|3|0|0|0|4|0|0|0|0|2|0|M|3|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|12|8|@$D|13|E|14|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|15|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|16|8|@$D|17|E|18|F|G]]|9|@]|A|$]]|$1|L|3|M|5|6|7|19|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|1A|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|1B|8|@$D|1C|E|1D|F|G]]|9|@]|A|$]]|$1|R|3|S|5|6|7|1E|8|@]|9|@$D|1F|E|1G|1|1H]]|A|$]]|$1|T|3|-4|5|6|7|1I|8|@]|9|@]|A|$]]]|U|$V|$5|W|X|Y|A|$Z|10]]]]

Aside from what's already been said, two very common uses that have not been listed are

Hashes:

Hashes are one-way functions that transform a block of bytes into another block of bytes of a fixed size such as 128bit or 256bit (SHA/MD5). Converting the resulting bytes into Base64 makes it much easier to display the hash especially when you are comparing a checksum for integrity. Hashes are so often seen in Base64 that many people mistake Base64 itself as a hash.

Cryptography:

Since an encryption key does not have to be text but raw bytes it is sometimes necessary to store it in a file or database, which Base64 comes in handy for. Same with the resulting encrypted bytes.

Note that although Base64 is often used in cryptography is not a security mechanism. Anyone can convert the Base64 string back to its original bytes, so it should not be used as a means for protecting data, only as a format to display or store raw bytes more easily.

Certificates

x509 certificates in PEM format are base 64 encoded. <a href="http://how2ssl.com/articles/working_with_pem_files/">http://how2ssl.com/articles/working_with_pem_files/</a>

blocks|key|879210|text|Base64可用于多种用途。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|879211|主要原因是将二进制数据转换为可通过的数据。|879212|我有时使用它将JSON数据从一个站点传递到另一个站点，在cookie中存储有关用户的信息。|879213|注意:你可以用它来加密--我不明白为什么人们会说你不能，而且它不是加密，尽管它很容易被破解，而且会被人皱眉。加密只意味着将一串数据转换成另一串数据，这些数据可以稍后解密或不解密，这就是base64所做的。|879214|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

Base64 can be used for many purposes. 

The primary reason is to convert binary data to something passable.

I sometimes use it to pass JSON data around from one site to another, store information
in cookies about a user.

Note:
You "can" use it for encryption - I don't see why people say you can't, and that it's not encryption, although it would be easily breakable and is frowned upon. Encryption means nothing more than converting one string of data to another string of data that can be either later decrypted or not, and that's what base64 does.

blocks|key|1224091|text|我将在这里描述的Base64的用法有点麻烦。所以，如果你不喜欢黑客，请不要继续。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1224092|当我发现MySQL的utf8不支持4字节unicode字符时，我遇到了麻烦，因为它使用了3字节版本的utf8。那么，我做了些什么来支持MySQL的utf8上完整的4字节unicode呢？好的，base64在存储到数据库时对字符串进行编码，在检索时对base64进行解码。|1224093|由于base64的编解码速度非常快，上述工作非常完善。|1224094|你要注意以下几点：|1224095|Base64编码使用33%25的存储空间。|unordered-list-item|1224096|存储在数据库中的字符串不会是人类可读的(您可以将其作为数据库字符串使用基本加密形式的特性来出售)。|1224097|对于任何不支持unicode的存储引擎，都可以使用上述方法。|1224098|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|S|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|T|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|U|8|@]|9|@]|A|$]]|$1|K|3|L|5|J|7|V|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|W|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|P|$]]

The usage of Base64 I'm going to describe here is somewhat a hack. So if you don't like hacks, please do not go on.

I went into trouble when I discovered that MySQL's utf8 does not support 4-byte unicode characters since it uses a 3-byte version of utf8. So what I did to support full 4-byte unicode over MySQL's utf8? Well, base64 encode strings when storing into the database and base64 decode when retrieving.

Since base64 encoding and decoding is very fast, the above worked perfectly.

You have the following points to take note of:

<ul>
<li>Base64 encoding uses 33% more storage</li>
<li>Strings stored in the database wont be human readable (You could sell that as a feature that database strings use a basic form of encryption).</li>
</ul>

You could use the above method for any storage engine that does not support unicode.

blocks|key|224891|text|“当需要对二进制数据进行编码时，通常使用Base64编码方案，这些二进制数据需要存储并通过设计用于处理文本数据的媒体传输。这是为了确保数据在运输过程中不受修改地保持原状“(Wiki，2017年)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|224892|例如:您有一个只接受ASCII字符的web服务。您希望保存用户的数据，然后将其传输到其他位置(API)，但收件人希望接收未触及的数据。Base64就是为了这个。。。唯一的缺点是base64编码需要比常规字符串多出大约33%25的空间。|224893|另一个例子:+uenc+=+url+encoded+=+aHR0cDovL2xvYy5tYWdlbnRvLmNvbS9hc2ljcy1tZW4tcy1nZWwta2F5YW5vLXhpaS5odG1s+=+http://loc.querytip.com/asics-men-s-gel-kayano-xii.html。|offset|length|224894|如您所见，如果我们想将上次访问的URL作为参数发送，则不能在URL中添加char“/”，因为我们将打破“MOD重写”-+GET参数的属性/值规则。|224895|一个完整的例子是：“http://loc.querytip.com/checkout/cart/add/uenc/http://loc.magento.com/asics-men-s-gel-kayano-xii.html/product/93/”|224896|entityMap|0|LINK|mutability|MUTABLE|url|http://loc.querytip.com/asics-men-s-gel-kayano-xii.html|1|http://loc.querytip.com/checkout/cart/add/uenc/http://loc.magento.com/asics-men-s-gel-kayano-xii.html/product/93/^0|0|0|2V|1J|0|0|0|A|35|1|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|X|8|@]|9|@$F|Y|G|Z|1|10]]|A|$]]|$1|H|3|I|5|6|7|11|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|12|8|@]|9|@$F|13|G|14|1|15]]|A|$]]|$1|L|3|-4|5|6|7|16|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S]]|T|$5|O|P|Q|A|$R|U]]]]

“Base64 encoding schemes are commonly used when there is a need to encode binary data that needs be stored and transferred over media that are designed to deal with textual data. This is to ensure that the data remains intact without modification during transport”(Wiki, 2017)

Example could be the following: you have a web service that accept only ASCII chars. You want to save and then transfer user’s data to some other location (API) but recipient want receive untouched data. Base64 is for that. . . The only downside is that base64 encoding will require around 33% more space than regular strings.

Another Example:: uenc = url encoded = aHR0cDovL2xvYy5tYWdlbnRvLmNvbS9hc2ljcy1tZW4tcy1nZWwta2F5YW5vLXhpaS5odG1s = <a href="http://loc.querytip.com/asics-men-s-gel-kayano-xii.html" rel="noreferrer">http://loc.querytip.com/asics-men-s-gel-kayano-xii.html</a>.

As you can see we can’t put char “/” in URL if we want to send last visited URL as parameter because we would break attribute/value rule for “MOD rewrite” – GET parameter.

A full example would be: “<a href="http://loc.querytip.com/checkout/cart/add/uenc/http://loc.magento.com/asics-men-s-gel-kayano-xii.html/product/93/" rel="noreferrer">http://loc.querytip.com/checkout/cart/add/uenc/http://loc.magento.com/asics-men-s-gel-kayano-xii.html/product/93/</a>”

blocks|key|1224280|text|几年前，当邮件功能被引入时，随着时间的推移，这完全是基于文本的，需要像图像和媒体(音频、视频等)这样的附件。当这些附件通过internet+(基本上是二进制数据的形式)发送时，二进制数据损坏的可能性很大。因此，为了解决这个问题，BASE64出现了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1224281|二进制数据的问题是它包含空字符，在某些语言中，如C，C%2B%2B表示字符串的结尾，因此以包含空字节的原始形式发送二进制数据将阻止文件被完全读取并在损坏的数据中被引导。|1224282|例如：|1224283|在C和C%2B%2B中，这个"null“字符显示字符串的结尾。所以"HELLO“是这样存储的：|1224284|H、E、L、L、O|1224285|72+69+76+76+79+00|1224286|00号写着“停在这里”。|1224287|现在让我们深入研究BASE64编码是如何工作的。|1224288|需要注意的一点:字符串的长度应该是3的倍数。|1224289|示例1+:|offset|length|style|BOLD|1224290|要编码的字符串：“ace”，Length=3|1224291|将每个字符转换为十进制。|ordered-list-item|1224292|a=+97，c=+99，e=+101|1224293|​|1224294|📷|atomic|1224295|1224296|将每个小数改为8位二进制表示。|1224297|97=+01100001，99=+01100011,101=+01100101|1224298|合计:+01100001+01100011+01100101|1224299|在一组6位内分开。|1224300|011000+010110+001101+100101|1224301|计算二进制到十进制|1224302|011000=+24,010110=+22,001101=+13,100101=+37|1224303|使用base64图表将十进制字符隐藏到base64中。|1224304|24=+Y，22=+W，13=+N，37=+l|1224305|“=>”YWNl“|1224306|1224307|1224308|1224309|示例2+:|1224310|要编码的字符串：“abcd”Length=4，它不是3的倍数。因此，要使字符串长度乘以3，我们必须添加2位填充以使length=+6。填充位由“=”符号表示。|1224311|注意:一个填充位等于两个零00，所以两个填充位等于四个零0000。|1224312|所以让我们开始这个过程：-|1224313|1224314|a=+97，b=+98，c=+99，d=+100|1224315|1224316|97=+01100001，98=+01100010，99=+01100011,100=+01100100|1224317|1224318|011000,010110,001001,100011,011001，00|1224319|所以最后的6位是不完整的，所以我们插入两个填充位，等于4个零“0000”。|1224320|011000,010110,001001,100011,011001,000000+==|1224321|现在，它是平等的。尾端的两个等号表示添加了4个零(有助于解码)。|1224322|计算二进制到十进制。|1224323|011000=+24,010110=+22,001001=+9,100011=+35,011001=+25,000000=0+==|1224324|1224325|24=+Y，22=+W，9=+j，35=+j，25=+Z，0=+A+==|1224326|=>“YWJjZA==”|1224327|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/767b6cee5f5743a6674fdc4aeb1450da.png|imageAlt|1|https://developer.qcloudimg.com/http-save/yehe-900000/d30bdfeec91005086934f0d200b13b23.png^0|0|0|0|0|0|0|0|0|0|0|5|0|0|0|0|0|0|1|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|1|1|0|0|0|5|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|34|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|35|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|36|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|37|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|38|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|39|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|3A|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|3B|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|3C|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|3D|8|@$T|3E|U|3F|V|W]]|9|@]|A|$]]|$1|X|3|Y|5|6|7|3G|8|@]|9|@]|A|$]]|$1|Z|3|10|5|11|7|3H|8|@]|9|@]|A|$]]|$1|12|3|13|5|6|7|3I|8|@]|9|@]|A|$]]|$1|14|3|15|5|6|7|3J|8|@]|9|@]|A|$]]|$1|16|3|17|5|18|7|3K|8|@]|9|@$T|3L|U|3M|1|3N]]|A|$]]|$1|19|3|15|5|6|7|3O|8|@]|9|@]|A|$]]|$1|1A|3|1B|5|11|7|3P|8|@]|9|@]|A|$]]|$1|1C|3|1D|5|6|7|3Q|8|@]|9|@]|A|$]]|$1|1E|3|1F|5|6|7|3R|8|@]|9|@]|A|$]]|$1|1G|3|1H|5|11|7|3S|8|@]|9|@]|A|$]]|$1|1I|3|1J|5|6|7|3T|8|@]|9|@]|A|$]]|$1|1K|3|1L|5|11|7|3U|8|@]|9|@]|A|$]]|$1|1M|3|1N|5|6|7|3V|8|@]|9|@]|A|$]]|$1|1O|3|1P|5|11|7|3W|8|@]|9|@]|A|$]]|$1|1Q|3|1R|5|6|7|3X|8|@]|9|@]|A|$]]|$1|1S|3|1T|5|6|7|3Y|8|@]|9|@]|A|$]]|$1|1U|3|15|5|6|7|3Z|8|@]|9|@]|A|$]]|$1|1V|3|17|5|18|7|40|8|@]|9|@$T|41|U|42|1|43]]|A|$]]|$1|1W|3|15|5|6|7|44|8|@]|9|@]|A|$]]|$1|1X|3|1Y|5|6|7|45|8|@$T|46|U|47|V|W]]|9|@]|A|$]]|$1|1Z|3|20|5|6|7|48|8|@]|9|@]|A|$]]|$1|21|3|22|5|6|7|49|8|@]|9|@]|A|$]]|$1|23|3|24|5|6|7|4A|8|@]|9|@]|A|$]]|$1|25|3|10|5|11|7|4B|8|@]|9|@]|A|$]]|$1|26|3|27|5|6|7|4C|8|@]|9|@]|A|$]]|$1|28|3|1B|5|11|7|4D|8|@]|9|@]|A|$]]|$1|29|3|2A|5|6|7|4E|8|@]|9|@]|A|$]]|$1|2B|3|1H|5|11|7|4F|8|@]|9|@]|A|$]]|$1|2C|3|2D|5|6|7|4G|8|@]|9|@]|A|$]]|$1|2E|3|2F|5|6|7|4H|8|@]|9|@]|A|$]]|$1|2G|3|2H|5|6|7|4I|8|@]|9|@]|A|$]]|$1|2I|3|2J|5|6|7|4J|8|@]|9|@]|A|$]]|$1|2K|3|2L|5|11|7|4K|8|@]|9|@]|A|$]]|$1|2M|3|2N|5|6|7|4L|8|@]|9|@]|A|$]]|$1|2O|3|1P|5|11|7|4M|8|@]|9|@]|A|$]]|$1|2P|3|2Q|5|6|7|4N|8|@]|9|@]|A|$]]|$1|2R|3|2S|5|6|7|4O|8|@]|9|@]|A|$]]|$1|2T|3|-4|5|6|7|4P|8|@]|9|@]|A|$]]]|2U|$2V|$5|2W|2X|2Y|A|$2Z|30|31|-4]]|32|$5|2W|2X|2Y|A|$2Z|33|31|-4]]]]

Years ago, when mailing functionality was introduced, so that was utterly text based, as the time passed, need for attachments like image and media (audio,video etc) came into existence. When these attachments are sent over internet (which is basically in the form of binary data), the probability of binary data getting corrupt is high in its raw form. So, to tackle this problem BASE64 came along.
The problem with binary data is that it contains null characters which in some languages like C,C++ represent end of character string so sending binary data in raw form containing NULL bytes will stop a file from being fully read and lead in a corrupt data.
For Example :
In C and C++, this &quot;null&quot; character shows the end of a string. So &quot;HELLO&quot; is stored like this:
H E L L O
72 69 76 76 79 00
The 00 says &quot;stop here&quot;.
Now let’s dive into how BASE64 encoding works.
Point to be noted : Length of the string should be in multiple of 3.
Example 1 :
String to be encoded : “ace”, Length=3
<ol>
<li>Convert each character to decimal.</li>
</ol>
a= 97, c= 99, e= 101
<a href="https://i.stack.imgur.com/6wfbb.png" rel="noreferrer"><img src="https://i.stack.imgur.com/6wfbb.png" alt="enter image description here" /></a>
<ol start="2">
<li>Change each decimal to 8-bit binary representation.</li>
</ol>
97= 01100001, 99= 01100011, 101= 01100101
Combined : 01100001 01100011 01100101
<ol start="3">
<li>Separate in a group of 6-bit.</li>
</ol>
011000 010110 001101 100101
<ol start="4">
<li>Calculate binary to decimal</li>
</ol>
011000= 24, 010110= 22, 001101= 13, 100101= 37
<ol start="5">
<li>Covert decimal characters to base64 using base64 chart.</li>
</ol>
24= Y, 22= W, 13= N, 37= l
“ace” =&gt; “YWNl”
<a href="https://i.stack.imgur.com/tucMa.png" rel="noreferrer"><img src="https://i.stack.imgur.com/tucMa.png" alt="enter image description here" /></a>
Example 2 :
String to be encoded : “abcd” Length=4, it's not multiple of 3. So to make string length multiple of 3 , we must add 2 bit padding to make length= 6. Padding bit is represented by “=” sign.
Point to be noted : One padding bit equals two zeroes 00 so two padding bit equals four zeroes 0000.
So lets start the process :–
<ol>
<li>Convert each character to decimal.</li>
</ol>
a= 97, b= 98, c= 99, d= 100
<ol start="2">
<li>Change each decimal to 8-bit binary representation.</li>
</ol>
97= 01100001, 98= 01100010, 99= 01100011, 100= 01100100
<ol start="3">
<li>Separate in a group of 6-bit.</li>
</ol>
011000, 010110, 001001, 100011, 011001, 00
so the last 6-bit is not complete so we insert two padding bit which equals four zeroes “0000”.
011000, 010110, 001001, 100011, 011001, 000000 ==
Now, it is equal. Two equals sign at the end show that 4 zeroes were added (helps in decoding).
<ol start="4">
<li>Calculate binary to decimal.</li>
</ol>
011000= 24, 010110= 22, 001001= 9, 100011= 35, 011001= 25, 000000=0 ==
<ol start="5">
<li>Covert decimal characters to base64 using base64 chart.</li>
</ol>
24= Y, 22= W, 9= j, 35= j, 25= Z, 0= A ==
“abcd” =&gt; “YWJjZA==”

blocks|key|225079|text|一个十六进制数字是一小块(4位)。两个比特构成8位，也被称为1字节。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|225080|MD5生成128位输出，它使用32位十六进制数字序列表示，这些数字依次是32*4=128位。128位等于16字节(因为1字节是8位)。|225081|每个Base64字符编码6位(不包括最后一个可以编码2、4或6位的非pad字符；以及最终的pad字符(如果有的话))。因此，每个Base64编码，128位哈希至少需要⌈128/6⌉ = 22个字符，如果有的话，再加上衬垫。|225082|使用base64，我们可以产生所需长度(6、8或10)的编码输出。如果我们选择决定8个字符长的输出，它只占8个字节，而在128位哈希输出中占16个字节。|225083|因此，除了安全性，base64编码也被用来减少空间消耗。|225084|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|N|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|O|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

One hexadecimal digit is of one nibble (4 bits). Two nibbles make 8 bits which are also called 1 byte.

MD5 generates a 128-bit output which is represented using a sequence of 32 hexadecimal digits, which in turn are 32*4=128 bits. 128 bits make 16 bytes (since 1 byte is 8 bits).

Each Base64 character encodes 6 bits (except the last non-pad character which can encode 2, 4 or 6 bits; and final pad characters, if any). Therefore, per Base64 encoding, a 128-bit hash requires at least ⌈128/6⌉ = 22 characters, plus pad if any.

Using base64, we can produce the encoded output of our desired length (6, 8, or 10). 
If we choose to decide 8 char long output, it occupies only 8 bytes whereas it was occupying 16 bytes for 128-bit hash output.

So, in addition to security, base64 encoding is also used to reduce the space consumed.

blocks|key|225165|text|Base64是文本编码方案的二进制文件，它以ASCII字符串格式表示二进制数据。它被设计用来在网络通道上存储二进制格式的数据。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|225166|Base64机制使用64个字符进行编码。这些字符包括：|225167|10数值:即0,1,2,3，...,9|ordered-list-item|225168|26大写字母:即A、B、C、D、.、Z|225169|26小写字母:即a、b、c、d、.、z|225170|2个特殊字符(这些字符取决于操作系统)：即%2B、/|225171|+base64如何工作|225172|使用base64算法编码字符串的步骤如下：|225173|计算字符串中的字符数。如果它不是3的倍数，那么用特殊字符(即=)填充它，使其为3的倍数。|225174|将字符串转换为ASCII二进制格式8位使用ASCII表.|225175|转换成二进制格式后，将二进制数据分成6位的块.|225176|将6位二进制数据块转换为十进制数.|225177|根据base64索引表将小数转换为字符串。这个表可以作为一个例子。，但正如我所说，两个特殊字符可能会有所不同。|225178|现在，我们得到了输入字符串的编码版本。|225179|让我们举一个例子:将string+THS转换为base64编码字符串。|225180|数一下字符数:它已经是3个的倍数了。|225181|转换为ASCII二进制格式8位.(T)01010100+(H)01001000+(S)01010011|225182|将二进制数据分成6位块.我们得到010101+000100+100001+010011|225183|将6位二进制数据块转换为十进制numbers.We，得到21+4+33+19|225184|根据base64索引表将小数转换为字符串。我们找到了VEhT|225185|entityMap|0|LINK|mutability|MUTABLE|url|https://www.ascii-code.com/|1|https://base64.guru/learn/base64-characters^0|0|6|E|1D|0|0|R|0|0|J|0|0|J|0|0|J|0|0|O|0|0|B|0|0|L|0|0|18|0|0|S|J|8|0|0|0|N|0|0|H|0|0|1J|L|C|1|0|0|J|0|0|Z|0|0|I|0|0|1F|0|0|17|0|0|12|0|0|U|0^^$0|@$1|2|3|4|5|6|7|1S|8|@$9|1T|A|1U|B|C]|$9|1V|A|1W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1X|8|@$9|1Y|A|1Z|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|20|8|@$9|21|A|22|B|C]]|D|@]|E|$]]|$1|K|3|L|5|J|7|23|8|@$9|24|A|25|B|C]]|D|@]|E|$]]|$1|M|3|N|5|J|7|26|8|@$9|27|A|28|B|C]]|D|@]|E|$]]|$1|O|3|P|5|J|7|29|8|@$9|2A|A|2B|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|6|7|2C|8|@$9|2D|A|2E|B|C]]|D|@]|E|$]]|$1|S|3|T|5|6|7|2F|8|@$9|2G|A|2H|B|C]]|D|@]|E|$]]|$1|U|3|V|5|J|7|2I|8|@$9|2J|A|2K|B|C]]|D|@]|E|$]]|$1|W|3|X|5|J|7|2L|8|@$9|2M|A|2N|B|C]]|D|@$9|2O|A|2P|1|2Q]]|E|$]]|$1|Y|3|Z|5|J|7|2R|8|@$9|2S|A|2T|B|C]]|D|@]|E|$]]|$1|10|3|11|5|J|7|2U|8|@$9|2V|A|2W|B|C]]|D|@]|E|$]]|$1|12|3|13|5|J|7|2X|8|@$9|2Y|A|2Z|B|C]]|D|@$9|30|A|31|1|32]]|E|$]]|$1|14|3|15|5|6|7|33|8|@$9|34|A|35|B|C]]|D|@]|E|$]]|$1|16|3|17|5|6|7|36|8|@$9|37|A|38|B|C]]|D|@]|E|$]]|$1|18|3|19|5|J|7|39|8|@$9|3A|A|3B|B|C]]|D|@]|E|$]]|$1|1A|3|1B|5|J|7|3C|8|@$9|3D|A|3E|B|C]]|D|@]|E|$]]|$1|1C|3|1D|5|J|7|3F|8|@$9|3G|A|3H|B|C]]|D|@]|E|$]]|$1|1E|3|1F|5|J|7|3I|8|@$9|3J|A|3K|B|C]]|D|@]|E|$]]|$1|1G|3|1H|5|J|7|3L|8|@$9|3M|A|3N|B|C]]|D|@]|E|$]]|$1|1I|3|-4|5|6|7|3O|8|@]|D|@]|E|$]]]|1J|$1K|$5|1L|1M|1N|E|$1O|1P]]|1Q|$5|1L|1M|1N|E|$1O|1R]]]]

Base64 is a binary to a text encoding scheme that represents binary data in an ASCII string format. It is designed to carry data stored in binary format across the network channels.
Base64 mechanism uses 64 characters to encode. These characters consist of:
<ol>
<li>10 numeric value: i.e., 0,1,2,3,...,9</li>
<li>26 Uppercase alphabets: i.e., A,B,C,D,...,Z</li>
<li>26 Lowercase alphabets: i.e., a,b,c,d,...,z</li>
<li>2 special characters (these characters depends on operating system): i.e. +,/</li>
</ol>
How base64 works
The steps to encode a string with base64 algorithm are as follow:
<ol>
<li>Count the number of characters in a String. If it is not multiple of 3, then pad it with special characters (i.e. =) to make it multiple of 3.</li>
<li>Convert string to ASCII binary format 8-bit <a href="https://www.ascii-code.com/" rel="noreferrer">using the ASCII table</a>.</li>
<li>After converting to binary format, divide binary data into chunks of 6-bits.</li>
<li>Convert chunks of 6-bit binary data to decimal numbers.</li>
<li>Convert decimals to string according to the base64 Index Table. <a href="https://base64.guru/learn/base64-characters" rel="noreferrer">This table can be an example</a>, but as I said, 2 special characters may vary.</li>
</ol>
Now, we got the encoded version of the input string.
Let's make an example: convert string THS to base64 encoding string.
<ol>
<li>Count the number of characters: it is already a multiple of 3.
</li>
<li>Convert to ASCII binary format 8-bit. We got (T)01010100 (H)01001000 (S)01010011
</li>
<li>Divide binary data into chunks of 6-bits. We got 010101 000100 100001 010011
</li>
<li>Convert chunks of 6-bit binary data to decimal numbers.We got 21 4 33 19
</li>
<li>Convert decimals to string according to the base64 Index Table. We got VEhT
</li>
</ol>

blocks|key|879410|text|base64是以ASCII字符串格式表示二进制数据的文本编码方案的二进制文件。base64被设计用于跨通道传输二进制格式的数据。它接受任何形式的数据，并将其转换为一个长串纯文本。以前，我们不能像文件一样传输大量的数据，因为它是由2位字节组成的，但是我们的实际网络使用的是2⁷位字节。这就是base64编码出现在图片中的地方。但是，base64到底是什么意思呢？|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|879411|让我们理解base64的含义。|879412|base64+=+base%2B64|879413|我们可以调用base64作为基-+64+representation.base64只使用6位(2⁶=64个字符)来确保可打印的数据是人类可读的。但是，怎么做？我们也可以编写base65或base78，但为什么只有64呢？我们来证明一下。base64编码包含64个字符来编码任何字符串。base64包含：|879414|10数值，即0,1,2,3，…..9。|879415|26大写字母，即A、B、C、D、…….Z。|879416|26个小写字母，即a、b、c、d、……..z。|879417|两个特殊字符，即，%2B，/。取决于你的操作系统。|879418|base64算法遵循的步骤如下：|879419|计算字符串中的字符数。|ordered-list-item|879420|如果它不是具有特殊字符的3个衬垫的倍数，即=使它为3的倍数。|879421|以ASCII格式对字符串进行编码。|879422|现在，它将把ASCII转换成二进制格式，每个8位.|879423|在转换成二进制格式后，它将二进制数据分成6位的块.|879424|6位二进制数据的块现在将转换为十进制数字格式.|879425|使用base64索引表，小数将再次根据表格式转换为字符串。|879426|最后，我们将获得输入字符串的编码版本。|879427|entityMap^0|0|6|37|K|0|0|0|0|0|0|0|0|0|8|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1E|8|@$9|1F|A|1G|B|C]|$9|1H|A|1I|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1J|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|1K|8|@]|D|@]|E|$]]|$1|J|3|K|5|6|7|1L|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|1M|8|@]|D|@]|E|$]]|$1|N|3|O|5|6|7|1N|8|@]|D|@]|E|$]]|$1|P|3|Q|5|6|7|1O|8|@]|D|@]|E|$]]|$1|R|3|S|5|6|7|1P|8|@]|D|@]|E|$]]|$1|T|3|U|5|6|7|1Q|8|@$9|1R|A|1S|B|C]]|D|@]|E|$]]|$1|V|3|W|5|X|7|1T|8|@]|D|@]|E|$]]|$1|Y|3|Z|5|X|7|1U|8|@]|D|@]|E|$]]|$1|10|3|11|5|X|7|1V|8|@]|D|@]|E|$]]|$1|12|3|13|5|X|7|1W|8|@]|D|@]|E|$]]|$1|14|3|15|5|X|7|1X|8|@]|D|@]|E|$]]|$1|16|3|17|5|X|7|1Y|8|@]|D|@]|E|$]]|$1|18|3|19|5|X|7|1Z|8|@]|D|@]|E|$]]|$1|1A|3|1B|5|X|7|20|8|@]|D|@]|E|$]]|$1|1C|3|-4|5|6|7|21|8|@]|D|@]|E|$]]]|1D|$]]

The base64 is a binary to a text encoding scheme that represents binary data in an ASCII string format. base64 is designed to carry data stored in binary format across the channels. It takes any form of data and transforms it into a long string of plain text. Earlier we can not transfer a large amount of data like files because it is made up of 2⁸ bit bytes but our actual network uses 2⁷ bit bytes. This is where base64 encoding came into the picture. But, what actually does base64 mean?
let’s understand the meaning of base64.
base64 = base+64
we can call base64 as a radix-64 representation.base64 uses only 6-bits(2⁶ = 64 characters) to ensure the printable data is human readable. but, how? we can also write base65 or base78, but why only 64? let’s prove it.
base64 encoding contains 64 characters to encode any string.
base64 contains:
10 numeric value i.e., 0,1,2,3,…..9.
26 Uppercase alphabets i.e., A,B,C,D,…….Z.
26 Lowercase alphabets i.e., a,b,c,d,……..z.
two special characters i.e., +,/. Depends upon your OS.
The steps followed by the base64 algorithm are as follow:
<ol>
<li>count the number of characters in a String.</li>
<li>If it is not multiple of 3 pad with special character i.e., = to
make it multiple of 3.</li>
<li>Encode the string in ASCII format.</li>
<li>Now, it will convert the ASCII to binary format 8-bit each.</li>
<li>After converting to binary format, it will divide binary data into
chunks of 6-bits each.</li>
<li>The chunks of 6-bit binary data will now be converted to decimal
number format.</li>
<li>Using the base64 Index Table, the decimals will be again converted
to a string according to the table format.</li>
<li>Finally, we will get the encoded version of our input string.</li>
</ol>

I've heard people talking about "base 64 encoding" here and there. What is it used for?

What is base 64 encoding used for?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我听过人们到处谈论"base 64编码“。它是用来干什么的？

问64基编码用于什么？
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