訊息鑑別碼





在密碼學中，訊息鑑別碼（英语：Message authentication code，縮寫為MAC），又譯為訊息鉴别碼、文件訊息鑑別碼、讯息鉴别码、信息認證碼，是經過特定演算法後產生的一小段資訊，檢查某段訊息的完整性，以及作身份验证。它可以用來檢查在訊息傳遞過程中，其內容是否被更改過，不管更改的原因是來自意外或是蓄意攻擊。同時可以作為訊息來源的身份验证，確認訊息的來源。


訊息鑑別碼的演算法中，通常会使用带密鑰的散列函數（HMAC），或者块密码的带认证工作模式（如CBC-MAC）。


信息鉴别码不能提供对信息的保密，若要同时实现保密认证，同时需要对信息进行加密。



範例


MAC.svg



参考文献





参见



  • 金鑰雜湊訊息鑑別碼（HMAC）
















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