Cryptanalysis of LOKI

@inproceedings{Knudsen1991CryptanalysisOL,
  title={Cryptanalysis of LOKI},
  author={Lars R. Knudsen},
  booktitle={ASIACRYPT},
  year={1991}
}
In BPS90] Brown, Pieprzyk and Seberry proposed a new encryp-tion primitive, which encrypts and decrypts a 64-bit block of data using a 64-bit key. Furthermore they propose a way to build private versions of LOKI. In this paper we show rst that the keyspace of any LOKI-version is only 2 60 , not 2 64 as claimed. Therefore there are 15 equivalent keys for every key, that encrypts/decrypts texts the same way. An immediate consequence is, that the proposed Single Block Hash Mode is no good. It is… CONTINUE READING

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No rounds of type A and thereby 22 rounds of type B

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P(15r) 2 ?13;12 (2 ?6 ) 9 = 2 ?67

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We have at least 4 rounds of type A. The remaining 4 (nonzero) rounds have a probability of at most 2 ?6 . We get: P(15R) (2 ?13;12 ) 4 (2 ?6 ) 4 = 2 ?76

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zero-rounds: First round and then every other round are zero-rounds. The remaining 7 rounds are all of type A. We get: P(15R) (2 ?13;12 ) 7 = 2 ?91

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