Triple DES, also written as 3DES or TDEA, strengthens the original Data Encryption Standard by applying the DES cipher three times in sequence to each data block, typically in an encrypt-decrypt-encrypt pattern using two or three distinct 56 bit keys to produce an effective key length of 112 or 168 bits. It was developed as an interim strengthening of DES after DES's key length was shown to be too short against brute force attack, and it saw wide use in banking and payment systems. NIST deprecated Triple DES for new applications in the 2010s in favor of AES.
Facts
Partially Attested
Credited ToWalter Tuchman; Ralph Merkle and Martin Hellman 1 Wikipedia credits Walter Tuchman with the 1978 two-key proposal and Merkle and Hellman with the 1981 triple-key version. Sources
1. Wikipedia: Triple DES
Development sectionQuote, Development section
In 1978, a triple encryption method using DES with two 56-bit keys was proposed by Walter Tuchman; in 1981, Merkle and Hellman proposed a more secure triple-key version of 3DES with 112 bits of security.
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