用新的高级加密标（AES）保持你的数据安全毕业论文外文翻译.docVIP

Keep Your Data Secure with the New Advanced Encryption Standard James McCaffrey SUMMARY The Advanced Encryption Standard (AES) is a National Institute of Standards and Technology specification for the encryption of electronic data. It is expected to become the accepted means of encrypting digital information, including financial, telecommunications, and government data. This article presents an overview of AES and explains the algorithms it uses..After reading this article you will be able to encrypt data using AES, test AES-based software, and use AES encryption in your systems. Note that the code presented in this article and any other implementation based on this article is subject to applicable Federal cryptographic module export controls (see Commercial Encryption Export Controls for the exact regulations). AES is a new cryptographic algorithm that can be used to protect electronic data. Specifically, AES is an iterative, symmetric-key block cipher that can use keys of 128, 192, and 256 bits, and encrypts and decrypts data in blocks of 128 bits (16 bytes). Unlike public-key ciphers, which use a pair of keys, symmetric-key ciphers use the same key to encrypt and decrypt data. Encrypted data returned by block ciphers have the same number of bits that the input data had. Iterative ciphers use a loop structure that repeatedly performs permutations and substitutions of the input data. Figure 1 shows AES in action encrypting and then decrypting a 16-byte block of data using a 192-bit key. Figure 1 Some Data AES is the successor to the older Data Encryption Standard (DES). DES was approved as a Federal standard in 1977 and remained viable until 1998 when a combination of advances in hardware, software, and cryptanalysis theory allowed a DES-encrypted message to be decrypted in 56 hours. Since that time numerous other successful attacks on DES-encrypted data have been made and DES is now considered past its useful lifetime.In late 1999, the Rijndael (pronounced rain