![]() ![]() When spoken, "DES" is either spelled out ( dee-ee-ess) or pronounced as a single syllable ( dez or dess). In some documentation, a distinction is made between DES as a standard, and the algorithm, which is referred to as the DEA (the Data Encryption Algorithm). In recent years, the cipher has been superseded by the Advanced Encryption Standard (AES). The algorithm is believed to be practically secure in the form of Triple DES, although there are theoretical attacks. There are also some analytical results which demonstrate theoretical weaknesses in the cipher, although they are infeasible to mount in practice. ![]() This is chiefly due to the 56-bit key size being too small DES keys have been broken in less than 24 hours. DES consequently came under intense academic scrutiny, and motivated the modern understanding of block ciphers and their cryptanalysis.ĭES is now considered to be insecure for many applications. The algorithm was initially controversial, with classified design elements, a relatively short key length, and suspicions about a National Security Agency (NSA) backdoor. The Data Encryption Standard ( DES) is a cipher (a method for encrypting information) selected as an official Federal Information Processing Standard (FIPS) for the United States in 1976, and which has subsequently enjoyed widespread use internationally. As of 2004, the best analytical attack is linear cryptanalysis, which requires 2 43 known plaintexts and has a time complexity of 2 39-43 (Junod, 2001) under a chosen-plaintext assumption, the data complexity can be reduced by a factor of four (Knudsen and Mathiassen, 2000). DES is now considered insecure because a brute force attack is possible (see EFF DES cracker). ![]()
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