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**2017/462**

**Title:**

Leakage-Resilient Tweakable Encryption from One-Way Functions

**Authors:**
Suvradip Chakraborty, Chester Rebeiro, Debdeep Mukhopadhyay, C. Pandu Rangan

**Abstract:**

In this paper, we initiate the study of leakage-resilient tweakable encryption schemes in the relative key-leakage model, where the adversary can obtain (arbitrary) partial information about the secret key. We also focus on the minimal and generic assumptions needed to construct such a primitive. Interestingly, we show provably secure constructions of leakage-resilient (LR) tweakable encryption based on the sole assumption that one-way functions (OWF) exist via some interesting intermediate generic connections. A central tool used in our construction of LR-tweakable encryption is the notion of Symmetric-key tweakable weak hash proof system, which we introduce. This can be seen as a generalization of the Symmetric-key weak hash proof framework of Hazay et. al (Eurocryptâ€™13). Along the way, we also introduce a new primitive called tweakable weak pseudo-random functions (t-wPRF) and show how to generically construct it from weak-PRF. We then construct LR-version of t-wPRF and use it to construct LR-tweakable encryption.

**ePrint:**
https://eprint.iacr.org/2017/462

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