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    CAN304W3MessageauthenticationcodeMessageintegrity我们一直关注确保通信的保密性。Integrity:确保接收到的消息来自预期方,并且未被修改,即使攻击者控制该通道。保密(secrecy)和完整性(integrity)是正交的问题(orthogonalconcerns),可以有一个而没有另一个。加密可
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    CAN304W2ClassicalandmoderncryptographyClassicalcryptography完全依赖于通信双方之间共享的秘密信息(Private-keycryptography,又叫secret-key/shared-key/symmetric-keycryptography)。Securecommunication:双方共享一个密钥,用于安全通信。Securestorage:单
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    CAN304W1DefinitionTheprotectionaffordedtoanautomatedinformationsysteminordertoattaintheapplicableobjectivesofpreservingtheintegrity,availability,andconfidentialityofinformationsystemresources(includeshardware,software,firmw