Findings demonstrate the risk of forgery in digital signature scheme, implying vulnerabilities to secure messages.
Regardless of the choice of parameters, knowledge of a single signed message, i.e., a pair message/signature, produced by Kahrobaei-Koupparis digital signature scheme, proposed in [D. Kahrobaei and C. Koupparis, 2012], is sufficient to forge a valid signature for any other message.
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Alexander Ushakov (2025) studied this question.
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