International Data Encryption Algorithm
Symmetric-key block cipher / From Wikipedia, the free encyclopedia
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In cryptography, the International Data Encryption Algorithm (IDEA), originally called Improved Proposed Encryption Standard (IPES), is a symmetric-key block cipher designed by James Massey of ETH Zurich and Xuejia Lai and was first described in 1991. The algorithm was intended as a replacement for the Data Encryption Standard (DES). IDEA is a minor revision of an earlier cipher, the Proposed Encryption Standard (PES).
General | |
---|---|
Designers | Xuejia Lai and James Massey |
Derived from | PES |
Successors | MMB, MESH, Akelarre, IDEA NXT (FOX) |
Cipher detail | |
Key sizes | 128 bits |
Block sizes | 64 bits |
Structure | Lai–Massey scheme |
Rounds | 8.5 |
Best public cryptanalysis | |
The key can be recovered with a computational complexity of 2126.1 using narrow bicliques. This attack is computationally faster than a full brute-force attack, though not, as of 2013, computationally feasible.[1] |
The cipher was designed under a research contract with the Hasler Foundation, which became part of Ascom-Tech AG. The cipher was patented in a number of countries but was freely available for non-commercial use. The name "IDEA" is also a trademark. The last patents expired in 2012, and IDEA is now patent-free and thus completely free for all uses.[2]
IDEA was used in Pretty Good Privacy (PGP) v2.0 and was incorporated after the original cipher used in v1.0, BassOmatic, was found to be insecure.[3] IDEA is an optional algorithm in the OpenPGP standard.