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Cryptanalysis of Okamoto cryptosystems with continued fraction algorithm

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2 Author(s)
Li, D.X. ; Dept. of Comput. Sci., Xidian Univ., Xi'an, China ; Li, D.W.

Okamoto cryptosystems have drawn attention for their properties of fast encryption and decryption. A probabilistic attack based on the L3 algorithm was proposed by Vallee et al. (1988). Other attacks have also been proposed. In the letter, a very simple and fast attack with continued fractions is given, which can completely break the Okamoto cryptosystems.

Published in:

Electronics Letters  (Volume:27 ,  Issue: 22 )