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Identity-based proxy signature (IDBPSE) has attracted many researchers and scholars since it can simplify key management procedure of certificate-based public key setting. Recently, some IDBPSE schemes are constructed in the standard model. However, most of them have very loose security reductions. And they cannot resist the attack from the delegator and have low computational efficiency. In this...
At Eurocrypt'02, Horwitz and Lynn first introduced the concept of HIBS. Till now, many HIBS schemes have been proposed. Recently (2011), Yang et al.'s proposed a hierarchical identity based signature (HIBS) scheme based on computational Diffie-Hellman (CDH) assumption in the standard model. They claimed that their scheme has more secure and more efficient than the existing HIBS schemes. However, we...
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