CISSP考试指南笔记：3.19 应用加密技术

The cryptographic life cycle is the ongoing process of identifying your cryptography needs, selecting the right algorithms, provisioning the needed capabilities and services, and managing keys.

Services of Cryptosystems

Cryptosystems can provide the following services:

• Confidentiality
• Integrity
• Authentication
• Authorization
• Nonrepudiation

Digital Signatures

A digital signature is a hash value that has been encrypted with the sender’s private key. The act of signing means encrypting the message’s hash value with a private key.

The hashing function ensures the integrity of the message, and the signing of the hash value provides authentication and nonrepudiation.

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