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- W2609063781 abstract "In this work, we investigate how to protect public key encryption from both key-leakage attacks and tampering attacks. First, we formalize the notions of chosen ciphertext (CCA) security against key-leakage and tampering attacks. To this goal, we then introduce the concept of key-homomorphic hash proof systems and present a generic construction of public key encryption based on this new primitive. Our construction, compared with previous works, realizes leakage-resilience and tampering-resilience simultaneously but completely independently, so it can tolerate a larger amount of bounded-memory leakage and be instantiated with more flexibility. Moreover, it allows for an unbounded number of affine-tampering queries, even after the challenge phase. With slight adaptations, our construction also achieves CCA security against subexponentially hard auxiliary-input leakage attacks and a polynomial of affine-tampering attacks. Thus, to the best of our knowledge, we get the first public key encryption scheme secure against both auxiliary-input leakage attacks and tampering attacks. • Formalize LTR-CCA security w.r.t. both bounded-memory and auxiliary-input leakage. • Introduce the notion of KH-HPS, and present a generic construction of LTR-CCA PKE. • Get the 1st PKE secure against both auxiliary-input leakage and tampering attacks. • Give several instantiations based on some standard number-theoretical assumptions." @default.
- W2609063781 created "2017-05-05" @default.
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- W2609063781 date "2017-11-01" @default.
- W2609063781 modified "2023-10-17" @default.
- W2609063781 title "Public key encryption resilient to leakage and tampering attacks" @default.
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- W2609063781 doi "https://doi.org/10.1016/j.jcss.2017.03.004" @default.
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