DES是對(duì)稱性加密里常見的一種，是一種使用秘鑰加密的塊算法。秘鑰長(zhǎng)度是64位（bit）， 超過位數(shù)秘鑰被忽略。所謂對(duì)稱性加密，加密和解密秘鑰相同。對(duì)稱性加密一般會(huì)按照固定長(zhǎng)度，把待加密字符串分成塊。不足一整塊或者剛好最后有特殊填充字符。
常見的填充模式有：‘pkcs5’、‘pkcs7’、‘iso10126’、‘a(chǎn)nsix923’、‘zero’ 類型，包括DES-ECB、DES-CBC、DES-CTR、DES-OFB、DES-CFB。
2. DES算法原理
DES算法的入口參數(shù)：Key、Data、Mode。 Key為8個(gè)字節(jié)共64位，是DES算法的工作秘鑰；
Data也為8個(gè)字節(jié)64位，是要被加密或解密的數(shù)據(jù)； Mode為DES的工作方式，有兩種：加密或解密。
3.DES加密原理
DES 使用一個(gè) 56 位的密鑰以及附加的 8 位奇偶校驗(yàn)位，產(chǎn)生 64 位的分組大小。這是一個(gè)迭代的分組密碼，使用稱為 Feistel 的技術(shù)，其中將加密的文本塊分成兩半。
使用子密鑰對(duì)其中一半應(yīng)用循環(huán)功能，然后將輸出與另一半進(jìn)行“異或”運(yùn)算；接著交換這兩半，這一過程會(huì)繼續(xù)下去，但最后一個(gè)循環(huán)不交換。DES 使用 16 個(gè)循環(huán)，使用異或，置換，代換，移位操作四種基本運(yùn)算。
4.DES算法特點(diǎn)
分組比較短、秘鑰太短、密碼生命周期短、運(yùn)算速度較慢。
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