Search for one-round differential characteristics of lighweight block cipher Cypress-256

Rodinko, Mariia; Oliynykov, Roman; Eliseev, Roman A.

doi:10.1109/dessert.2018.8409150

Cited by 5 publications

(2 citation statements)

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“…Several methods of searching for the most probable one-round differential characteristics of Cypress-256 are presented in [14]. The optimized method allowed obtaining one-round differential characteristic with probability ¼.…”

Section: Searching For High-probable Multi-round Differential Charactmentioning

confidence: 99%

See 1 more Smart Citation

Differential Cryptanalysis of the Lightweight Block Cipher Cypress-256

Rodinko¹,

Oliynykov²,

Yubuzova³

2020

IJC

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This paper presents the results of differential cryptanalysis of the lightweight block cipher Cypress-256. The method for searching multi-round differential characteristic of the block cipher Cypress-256 is proposed. The searching assumes 1) building a big set of one-round differential characteristics and search for possible combinations of one-round characteristics into multi-round ones; 2) extending one-round differential characteristics with the probability up to certain threshold into multi-round characteristics. The following experiments show that the most probable one-round differential characteristics have input differences with 4-6 active bits which are distributed between different words. Besides that, high-probable one-round differential characteristics, which output differences have a small Hamming weight, cannot be extended to build high-probable multi-round differential characteristics. Due to application of the method assuming extension of one-round differential characteristics into multi-round ones, the differential characteristic up to 6 rounds was built, so 10-round block cipher Cypress-256 is resistant to differential cryptanalysis according to the requirements of practical criterion.

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Section: Searching For High-probable Multi-round Differential Charactmentioning

confidence: 99%

“…The previous papers devoted to Cypress analysis include the evaluation of cipher performance and avalanche properties [8] along with methods of searching for high-probable one-round differential characteristics of Cypress-256 [14].…”

Section: Introductionmentioning

confidence: 99%