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On the possibility of modifying the KB-256 algorithm from the searching for impossible differentials view point | Prikladnaya Diskretnaya Matematika - Applied Discrete Mathematics. 2025. № 67. DOI: 10.17223/20710410/67/3

The presence of impossible differentials in a block cipher algorithm can lead to efficient methods for recovering the secret key. A large number of impossible differentials have been found for the KB-256 algorithm. This paper considers the modification of the feedback function to reduce the number of iterations to which they can be extended. A general approach to finding differences with probability 1 is proposed. It is shown that changing the number of summable sub-blocks in the feedback function will not reduce the maximum number of iterations to which an infeasible differential can be extended.
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  • Title On the possibility of modifying the KB-256 algorithm from the searching for impossible differentials view point
  • Headline On the possibility of modifying the KB-256 algorithm from the searching for impossible differentials view point
  • Publesher Tomask State UniversityTomsk State University
  • Issue Prikladnaya Diskretnaya Matematika - Applied Discrete Mathematics 67
  • Date:
  • DOI 10.17223/20710410/67/3
Keywords
Feistel scheme, circulant matrix, impossible transitions of block differences, KB-256
Authors
References
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On the possibility of modifying the KB-256 algorithm from the searching for impossible differentials view point | Prikladnaya Diskretnaya Matematika - Applied Discrete Mathematics. 2025. № 67. DOI: 10.17223/20710410/67/3
On the possibility of modifying the KB-256 algorithm from the searching for impossible differentials view point | Prikladnaya Diskretnaya Matematika - Applied Discrete Mathematics. 2025. № 67. DOI: 10.17223/20710410/67/3
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