Abstract
Related-Key Attacks (RKAs) allow an adversary to observe the outcomes of a cryptographic primitive under not only its original secret key e.g., \(s\), but also a sequence of modified keys \(\phi (s)\), where \(\phi \) is specified by the adversary from a class \(\varPhi \) of so-called Related-Key Derivation (RKD) functions. This paper extends the notion of non-malleable Key Derivation Functions (nm-KDFs), introduced by Faust et al. (EUROCRYPT’14), to continuous nm-KDFs. Continuous nm-KDFs have the ability to protect against any a-priori unbounded number of RKA queries, instead of just a single time tampering attack as in the definition of nm-KDFs. Informally, our continuous non-malleability captures the scenario where the adversary can tamper with the original secret key repeatedly and adaptively. We present a novel construction of continuous nm-KDF for any polynomials of bounded degree over a finite field. Essentially, our result can be extended to richer RKD function classes possessing properties of high output entropy and input-output collision resistance. The technical tool employed in the construction is the one-time lossy filter (Qin et al. ASIACRYPT’13) which can be efficiently obtained under standard assumptions, e.g., DDH and DCR. We propose a framework for constructing \(\varPhi \)-RKA-secure IBE, PKE and signature schemes, using a continuous nm-KDF for the same \(\varPhi \)-class of RKD functions. Applying our construction of continuous nm-KDF to this framework, we obtain the first RKA-secure IBE, PKE and signature schemes for a class of polynomial RKD functions of bounded degree under standard assumptions. While previous constructions for the same class of RKD functions all rely on non-standard assumptions, e.g., \(d\)-extended DBDH assumption.
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Qin, B., Liu, S., Yuen, T.H., Deng, R.H., Chen, K. (2015). Continuous Non-malleable Key Derivation and Its Application to Related-Key Security. In: Katz, J. (eds) Public-Key Cryptography -- PKC 2015. PKC 2015. Lecture Notes in Computer Science(), vol 9020. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-46447-2_25
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