摘要

To improve the security and efficiency of the id-based verifiably encrypted signature (ID-VES) schemes, constructing a fraction in which the mast key is included in the numerator and the sum of the session key and the output of the hash function is included in the denominator, and using the fraction to multiply the generator of the gap Diffie-Hellman group, an id-based signature scheme is proposed. Then, by dividing the private key of the signer into two parts in which the former is used to generate an ID-based signature and the later is used to generator ID-VES, a novel ID-VES scheme is proposed, which can be proved to be secure in random oracle model. Compared with the other schemes, the new scheme is more efficient, since it has the shortest signature and the least pairing operations.

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