Cryptology ePrint Archive: Report 2016/604

FMNV Continuous Non-malleable Encoding Scheme is More Efficient Than Believed

Amir S. Mortazavia and Mahmoud Salmasizadeh and Amir Daneshgar

Abstract: Non-malleable codes are kind of encoding schemes which are resilient to tampering attacks. The main idea behind the non-malleable coding is that the adversary can't be able to obtain any valuable information about the message. Non-malleable codes are used in tamper resilient cryptography and protecting memory against tampering attacks. Several kinds of definitions for the non-malleability exist in the literature. The Continuous non-malleability is aiming to protect messages against the adversary who issues polynomially many tampering queries. The first continuous non-malleable encoding scheme has been proposed by Faust et el. (FMNV) in 2014. In this paper, we propose a new method for proving continuous non-malleability of FMNV scheme. This new proof leads to an improved and more efficient scheme than previous one. The new proof shows we can have the continuous non-malleability with the same security by using a leakage resilient storage scheme with about (k+1)(log(q)-2) bits fewer leakage bound (where k is the output size of the collision resistant hash function and q is the maximum number of tampering queries).

Category / Keywords: non-malleable, continuous non-malleability, tamper-resilient cryptography

Date: received 8 Jun 2016, last revised 8 Jun 2016

Contact author: sa_mortazavi at ee sharif edu

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Version: 20160610:151740 (All versions of this report)

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