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HOP-1 and HOP-2: New Re-keying Schemes for Symmetric Ciphers

Year: 2026

Type: article

Abstract: Re-keying is one of the most effective techniques to protect symmetric ciphers against side-channel attacks. Since its introduction, numerous re-keying schemes have been developed. This paper proposes two new index-based re-keying schemes, HOP-1 and HOP-2, which are variants of Kocher's re-keying scheme. Specifically, through tree-based analysis of Kocher's re-keying scheme, we identify strategies to minimize key repetition in Kocher's approach. We compare HOP-1 and HOP-2 with existing re-keying schemes and evaluate their application to two leakage-resilient authenticated encryption schemes, highlighting their effectiveness relative to these other re-keying schemes.

Source: IACR Communications in Cryptology

DOI: 10.62056/avl8ksuc2

Authors: Jinkeon Kang, Seokhie Hong, Donghoon Chang, Moti Yung

Institutions: Intuidex (United States), Contec Co., Ltd. (Japan), Indraprastha Institute of Information Technology Delhi, National Institute of Standards and Technology, National Institute of Science and Technology, Columbia University

Language: English

Topic: Cryptographic Implementations and Security

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: hybrid

OpenAlex ID: W7119476195

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Cites: 10

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