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There are various implementations of the Advanced Encryption Standard, also known as Rijndael. == Libraries == Rijndael is free for any use public or private, commercial or non-commercial. The authors of Rijndael used to provide a homepage〔(Original homepage ) and (archived copy )〕 for the algorithm. Care should be taken when implementing AES in software. Like most encryption algorithms, Rijndael was designed on big-endian systems. For this reason, little-endian systems, which include the common PC, return correct test vector results only through swapping bytes of the input and output words. The algorithm operates on plaintext blocks of 16 bytes. Encryption of shorter blocks is possible only by padding the source bytes, usually with null bytes. This can be accomplished via several methods, the simplest of which assumes that the final byte of the cipher identifies the number of null bytes of padding added. Careful choice must be made in selecting the mode of operation of the cipher. The simplest mode encrypts and decrypts each 128-bit block separately. In this mode, called "electronic code book (ECB)", blocks that are identical will be encrypted identically, which is entirely insecure. This will make some of the plaintext structure visible in the ciphertext. Selecting other modes, such as empressing a sequential counter over the block prior to encryption (CTR mode) and removing it after decryption avoids this problem. * Current list of FIPS 197 validated cryptographic modules (hosted by NIST) * Current list of FIPS 140 validated cryptographic modules with validated AES implementations (hosted by NIST) - Most of these involve a commercial implementation of AES algorithms. Look for "FIPS-approved algorithms" entry in the "Level / Description" column followed by "AES" and then a specific certificate number. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「AES implementations」の詳細全文を読む スポンサード リンク
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