Abstract
The concept of multisignature, in which multiple signers can cooperate to sign the same message and any verifier can verify the validity of the multi-signature, was first introduced by Itakura and Nakamura. Several multisignature schemes have been proposed since. Chen et al. proposed a new digital multi-signature scheme based on the elliptic curve cryptosystem recently. In this paper, we show that their scheme is insecure, for it is vulnerable to the so-called active attacks, such as the substitution of a “false” public key to a “true” one in a key directory or during transmission. And then the attacker can sign a legal signature which other users have signed and forge a signature himself which can be accepted by the verifier.
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This work is supported by the National Natural Science Foundation of China under Grant No. 90304014 and the National Grand Fundamental Research 973 Program of China under Grant No. 2003CB314805.
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Liu, D., Luo, P. & Dai, YQ. Attack on Digital Multi-Signature Scheme Based on Elliptic Curve Cryptosystem. J Comput Sci Technol 22, 92–94 (2007). https://doi.org/10.1007/s11390-007-9005-y
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DOI: https://doi.org/10.1007/s11390-007-9005-y