L. Harn (1994) proposed a digital signature scheme which was claimed to be unbreakable if the factorisation and the discrete logarithms are simultaneously unsolvable. The paper shows that `hackers' can forge the signatures of Harn schemes with high probabilities, if they can solve the discrete logarithms modulo α large prime number. The Harn signature scheme is modified to give it the same degree of security as was originally claimed
Published in:
Computers and Digital Techniques, IEE Proceedings -
(Volume:143
,
Issue:
3
)
Date of Publication: May 1996