blocks|key|852821|text|php的crypt函数是一个单向散列函数，如果你想解密，看看支持a+range+of+algorithms的mcrypt扩展|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|852822|entityMap|0|LINK|mutability|MUTABLE|url|http://us2.php.net/crypt|1|http://us2.php.net/manual/en/mcrypt.ciphers.php|2|http://us2.php.net/manual/en/book.mcrypt.php^0|4|5|0|W|L|1|1I|6|2|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]|$A|T|B|U|1|V]|$A|W|B|X|1|Y]]|C|$]]|$1|D|3|-4|5|6|7|Z|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]|N|$5|G|H|I|C|$J|O]]]]

The php <a href="http://us2.php.net/crypt" rel="nofollow noreferrer">crypt</a> function is a one-way hashing function, if you want to be able to decrypt, take a look at the <a href="http://us2.php.net/manual/en/book.mcrypt.php" rel="nofollow noreferrer">mcrypt</a> extension which supports <a href="http://us2.php.net/manual/en/mcrypt.ciphers.php" rel="nofollow noreferrer">a range of algorithms</a>

blocks|key|4045742|text|应该注意的是，围绕DES算法存在(并且一直存在)问题。它已经被广泛使用了很长一段时间，但由于它最初只使用56位密钥指定，因此在这一点上它是否足够安全以用于任何重要用途都是值得怀疑的。三重DES通常更好，但也有一些已知的理论攻击。如果您可以选择密码，那么您可能希望改为使用AES。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4045743|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Data_Encryption_Standard|1|http://en.wikipedia.org/wiki/Advanced_Encryption_Standard^0|9|3|0|3R|3|1|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]|$A|R|B|S|1|T]]|C|$]]|$1|D|3|-4|5|6|7|U|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]|L|$5|G|H|I|C|$J|M]]]]

It should be noted that there are (and have always been) questions surrounding the <a href="http://en.wikipedia.org/wiki/Data_Encryption_Standard" rel="nofollow noreferrer">DES</a> algorithm. It's been widely in use for a long time, but since it was originally specified with only a 56 bit key, it's questionable whether it's secure enough for any important uses at this point. Triple DES is generally better, but there are some known theoretical attacks. If you have a choice of cipher, you might want to look at <a href="http://en.wikipedia.org/wiki/Advanced_Encryption_Standard" rel="nofollow noreferrer">AES</a> instead.

blocks|key|5457225|text|DES是可逆的，所以它是双向加密的(如果你是这个意思的话)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5457226|DES是一个非常著名的加密标准，所以它也应该在PHP中可用。|5457227|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|$]]

DES can be reversed, so it's a two-way encryption (if you meant that).

DES is a pretty well known encryption standard so it should be available in PHP too.

blocks|key|852894|text|One-way+encryption是一种安全的散列形式:明文被更改为明显随机的数据序列，通常具有固定长度，这样，如果不进行暴力破解，(理论上)无法检索原始明文。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|852895|双向加密协议(+Two-way+encryption+)，或可逆加密协议(+reversible+encryption+)是我们通常所说的术语加密:明文被转换为明显随机的数据，但转换方式依赖于允许检索原始明文的“密钥”。|852896|DES是一种可逆加密形式，按照当今的标准，它相对较弱，因为它依赖于56位密钥(14个十六进制字符)。它已经被3DES或三重DES所取代，后者本质上是具有更长密钥的相同算法。|852897|您没有提到您的应用程序，但是如果您只需要比较数据，而不需要检索数据，则散列被认为更安全。例如，您可以存储散列密码；然后，当用户进行身份验证时，对输入的文本执行相同的散列，并将其与存储的散列值进行比较。如果它们匹配，则输入了正确的密码。|852898|散列的一个重要优点是您不需要存储解密密钥。|852899|entityMap^0|0|I|0|8|I|12|L|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|X|8|@]|D|@]|E|$]]|$1|J|3|K|5|6|7|Y|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|Z|8|@]|D|@]|E|$]]|$1|N|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|O|$]]

One-way encryption is a secure form of hashing: the plaintext is changed into an apparently random sequence of data, often of fixed length, in such a way that the original plaintext (theoretically) cannot be retrieved without a brute-force effort.

Two-way encryption, or reversible encryption is what we normally mean by the term encryption: the plaintext is transformed into apparently random data, but in a way that relies on a "key" that allows the original plaintext to be retrieved.

DES is a form of reversible encryption that is relatively weak by today's standards, as it relies on a 56-bit key (14 hex characters). It has been superseded by 3DES, or triple-DES, which is essentially the same algorithm with a longer key.

You don't mention your application, but if you need only to compare the data and not retrieve it, hashing is considered more secure. For example, you can store hashed passwords; then, when a user authenticates, perform the same hash on the entered text and compare it with the stored hashed value. If they match, the correct password was entered.

A significant advantage to hashing is that you don't need to store a decryption key.

blocks|key|3199463|text|我不熟悉“单向加密”或“双向加密”这两个术语。有一个术语“一次性密码”(与DES完全无关)，并且有“对称”和“非对称”加密算法，意思是使用相同的密钥进行加密和解密(对称)，或者使用一组两个不同的密钥，一个用于加密，另一个用于解密(非对称)。DES是一种对称算法。至于PHP，可以使用crypt()来完成这项工作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3199464|http://us2.php.net/crypt|offset|length|3199465|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|O|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]]]]

I am not familiar with the "one way encryption" or "two way encryption" terms. There is a term "one time password" (totally irrelevant for DES), and there are "symmetric" and "assymetric" encryption algorithms, meaning whether the same key is used for encryption and decryption (symmetric) or a set of two different keys is used one for encryption and another for decryption (assymetric). DES is a symmetric algorithm. As for PHP, crypt() since to be doing the job:

<a href="http://us2.php.net/crypt" rel="nofollow noreferrer">http://us2.php.net/crypt</a>

blocks|key|852953|text|我想你可能指的是单向函数1。在密码学中，人们区分对称密码学和非对称密码学。对称加密使用相同的密钥进行加密和解密(DES是对称的)。非对称加密用于密钥交换，公钥用于加密消息，而私钥用于解密消息。非对称加密的一个例子是AES+2。非对称加密使用单向函数。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|852954|1+2|offset|length|852955|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/One-way_function|1|http://en.wikipedia.org/wiki/AES^0|0|0|1|0|2|1|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@$D|R|E|S|1|T]|$D|U|E|V|1|W]]|A|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]|N|$5|I|J|K|A|$L|O]]]]

I Think you probably mean a one-way function [1]. In cryptography one distinguishes between symmetric and asymmetric cryptography. Symmetric cryptography uses the same key to encrypt and decrypt (DES is symmetric). Asymmetric Cryptography is used for key exchange and a public key is used to encrypt the message, while the private key is used to decrypt it. An example of Asymmetric Cryptography is AES [2]. Asymmetric cryptography uses one way functions.

[1] <a href="http://en.wikipedia.org/wiki/One-way_function" rel="nofollow noreferrer">http://en.wikipedia.org/wiki/One-way_function</a>
[2] <a href="http://en.wikipedia.org/wiki/AES" rel="nofollow noreferrer">http://en.wikipedia.org/wiki/AES</a>

Are DES Encryption called "One Way Encryption" or "two way Encryption" ?
Are there a PHP class or method decrypt the DES Encryption ?
thanks

DES Encryption

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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DES加密叫“单向加密”还是“双向加密”？有没有PHP类或方法来解密DES加密？谢谢

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