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In cryptography, Triple DES (3DES) is the common name for the Triple Data Encryption Algorithm (TDEA or Triple DEA) symmetric-key block cipher, which applies the Data Encryption Standard (DES) cipher algorithm three times to each data block. The original DES cipher's key size of 56 bits was generally sufficient when that algorithm was designed, but the availability of increasing computational power made brute-force attacks feasible. Triple DES provides a relatively simple method of increasing the key size of DES to protect against such attacks, without the need to design a completely new block cipher algorithm. ==Definitive standards== The Triple Data Encryption Algorithm (TDEA) is defined in each of: * ANS〔X9.52 is sometimes erroneously referred to as ANSI X9.52, however the standard itself has the designation ANS X9.52.〕 X9.52-1998 ''Triple Data Encryption Algorithm Modes of Operation''〔X9.52 defines TDEA as a compound operation of the Data Encryption Algorithm specified in ANSI X3.92-1981 ''Data Encryption Algorithm'', and does not include the DEA specification. Thus X9.52 must be read in conjunction with X3.92.〕 (withdrawn) * FIPS PUB 46-3 ''Data Encryption Standard (DES)'' (does not include keying options) (withdrawn) * NIST Special Publication 800-67 Revision 1 ''Recommendation for the Triple Data Encryption Algorithm (TDEA) Block Cipher * ISO/IEC 18033-3:2010: Part 3: Block ciphers 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「Triple DES」の詳細全文を読む スポンサード リンク
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