Attacking an OT-Based Blind Signature Scheme

Details Attacking an OT-Based Blind Signature Scheme Attacking an OT-Based Blind Signature Scheme

2009-06-16

arxiv.org/abs/0906.2947v4

Computer Science

Cryptography and Security

3 pages, 2 figures, sumbitted for evaluation, under the title "Security Analysis of an OT-based blind signature scheme"

Scientific paper

In this paper, we describe an attack against one of the Oblivious-Transfer-based blind signatures scheme, proposed in [1]. An attacker with a primitive capability of producing specific-range random numbers, while exhibiting a partial MITM behavior, is able to corrupt the communication between the protocol participants. The attack is quite efficient as it leads to a protocol communication corruption and has a sound-minimal computational cost. We propose a solution to fix the security flaw.

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