Cryptology ePrint Archive: Report 2022/291

Provable security of CFB mode of operation with external re-keying

Vadim Tsypyschev and Iliya Morgasov

Abstract: In this article it is investigated security of the cipher feedback mode of operation with regular external serial re-keying aiming to construct lightweight pseudo-random sequences generator. For this purpose it was introduced new mode of operation called Multi-key CFB, MCFB, and was obtained the estimations of provable security of this new mode in the LOR-CPA model. Besides that. it was obtained counterexample to well-known result of Abdalla-Bellare about security of encryption scheme with external re-keying.

Category / Keywords: secret-key cryptography / Multy-key CFB, external serial re-keying, provable security

Date: received 2 Mar 2022

Contact author: tsypyschev at yandex ru

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Version: 20220307:123907 (All versions of this report)

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