The author proposes digital signature schemes without using a one-way function to sign Diffie-Hellman public keys. The advantage of this approach is, instead of relying overall security on either the security of the signature scheme or the security of the one-way function, the security of this proposed scheme is based on the discrete logarithm problem.
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http://iet.metastore.ingenta.com/content/journals/10.1049/el_19970071
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