LOKI97: AES Candidate & Cryptography Block Cipher
LOKI97 is a block cipher from the LOKI family, once a candidate in the AES competition, used in cryptography for data security. π
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136 views β’ May 10, 2016
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In cryptography, LOKI97 is a block cipher which was a candidate in the Advanced Encryption Standard competition. It is a member of the LOKI family of ciphers, earlier instances being LOKI89 and LOKI91. LOKI97 was designed by Lawrie Brown, assisted by Jennifer Seberry and Josef Pieprzyk.
Like DES, LOKI97 is a 16-round Feistel cipher, and like other AES candidates, has a 128-bit block size and a choice of a 128-, 192- or 256-bit key length. It uses 16 rounds of a balanced feistel network to process the input data blocks. The complex round function f incorporates two substitution-permutation layers in each round.The key schedule is also a Feistel structure an unbalanced one unlike the main network but using the same F-function.
The LOKI97 round function uses two columns each with multiple copies of two basic S-boxes. These S-boxes are designed to be highly non-linear and have a good XOR profile. The permutations before and between server to provide auto-keying and to diffuse the S-box outputs as quickly as possible.
The authors have stated that, 'LOKI97 is a non-proprietary algorithm, available for royalty-free use worldwide as a possible replacement for the DES or other existing block ciphers.' It was intended to be an evolution of the earlier LOKI89 and LOKI91 block ciphers.
It was the first published candidate in the Advanced Encryption Standard competition, and was quickly analysed and attacked. An analysis of some problems with the LOKI97 design, which led to its rejection when shortlisting candidates, is given in the paper. It was found to be susceptible to an effective theoretical differential cryptanalysis attack considerably faster than an exhaustive search.
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This video uses material from https://en.wikipedia.org/wiki/LOKI97, licensed with CC Attribution-ShareAlike 3.0. This video is licensed with CC Attribution-Share-Alike 3.0 https://creativecommons.org/licenses/by-sa/3.0/us/ In order to adapt this content it is required to comply with the license terms. Image licensing information is available via: https://en.wikipedia.org/wiki/LOKI97
Like DES, LOKI97 is a 16-round Feistel cipher, and like other AES candidates, has a 128-bit block size and a choice of a 128-, 192- or 256-bit key length. It uses 16 rounds of a balanced feistel network to process the input data blocks. The complex round function f incorporates two substitution-permutation layers in each round.The key schedule is also a Feistel structure an unbalanced one unlike the main network but using the same F-function.
The LOKI97 round function uses two columns each with multiple copies of two basic S-boxes. These S-boxes are designed to be highly non-linear and have a good XOR profile. The permutations before and between server to provide auto-keying and to diffuse the S-box outputs as quickly as possible.
The authors have stated that, 'LOKI97 is a non-proprietary algorithm, available for royalty-free use worldwide as a possible replacement for the DES or other existing block ciphers.' It was intended to be an evolution of the earlier LOKI89 and LOKI91 block ciphers.
It was the first published candidate in the Advanced Encryption Standard competition, and was quickly analysed and attacked. An analysis of some problems with the LOKI97 design, which led to its rejection when shortlisting candidates, is given in the paper. It was found to be susceptible to an effective theoretical differential cryptanalysis attack considerably faster than an exhaustive search.
Video Empire produces videos read aloud. Use the information in this video at your own risk. We cannot always guarantee accuracy.
This video uses material from https://en.wikipedia.org/wiki/LOKI97, licensed with CC Attribution-ShareAlike 3.0. This video is licensed with CC Attribution-Share-Alike 3.0 https://creativecommons.org/licenses/by-sa/3.0/us/ In order to adapt this content it is required to comply with the license terms. Image licensing information is available via: https://en.wikipedia.org/wiki/LOKI97
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136
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2:10
Published
May 10, 2016
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