開發與維運

2020/11/29-A-關於DES淺談

數據加密算法(Data Encryption Algorithm,DEA)是一種對稱加密算法,很可能是使用最廣泛的密鑰系統,特別是在保護金融數據的安全中,最初開發的DEA是嵌入硬件中的。通常,自動取款機(Automated Teller Machine,ATM)都使用DEA。它出自IBM的研究工作,IBM也曾對它擁有幾年的專利權,但是在1983年已到期後,處於公有範圍中,允許在特定條件下可以免除專利使用費而使用。1977年被美國政府正式採納。 DES的原始思想可以參照二戰德國的恩格瑪機,其基本思想大致相同。傳統的密碼加密都是由古代的循環移位思想而來,恩格瑪機在這個基礎之上進行了擴散模糊。但是本質原理都是一樣的。現代DES在二進制級別做著同樣的事:替代模糊,增加分析的難度。 DES的加密原理,是使用一個 56 位的密鑰以及附加的 8 位奇偶校驗位,產生最大 64 位的分組大小。這是一個迭代的分組密碼,使用稱為 Feistel 的技術,其中將加密的文本塊分成兩半。使用子密鑰對其中一半應用循環功能,然後將輸出與另一半進行“異或”運算;接著交換這兩半,這一過程會繼續下去,但最後一個循環不交換。DES 使用 16 個循環,使用異或,置換,代換,移位操作四種基本運算。 類似於: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當然,這些都是base64編碼。那麼,什麼是base64呢? Base64是網絡上最常見的用於傳輸8Bit字節代碼的編碼方式之一,大家可以查看RFC2045~RFC2049,上面有MIME的詳細規範。Base64編碼可用於在HTTP環境下傳遞較長的標識信息。例如,在Java Persistence系統Hibernate中,就採用了Base64來將一個較長的唯一標識符(一般為128-bit的UUID)編碼為一個字符串,用作HTTP表單和HTTP GET URL中的參數。在其他應用程序中,也常常需要把二進制數據編碼為適合放在URL(包括隱藏表單域)中的形式。此時,採用Base64編碼不僅比較簡短,同時也具有不可讀性,即所編碼的數據不會被人用肉眼所直接看到。 比如,編寫一個“123”,得出的結果就是“MTIz”。

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