DES( Data Encryption Standard)算法，于1977年得到美国政府的正式许可，是一种用56位密钥来加密64位数据的方法。虽然56位密钥的DES算法已经风光不在,而且常有用Des加密的明文被破译的报道,但是了解一下昔日美国的标准加密算法总是有益的,而且目前DES算法得到了广泛的应用-DES (Data Encryption Standard) algorithm. in 1977 the United States government's official permission, is a key 56 to 64 data encryption methods. Although the 56-key DES algorithm has not scenery, but often with the explicit Des encryption was cracked reports, But the United States to find out the old standard encryption algorithm is always useful, but the current DES algorithm is a widely used