Proxy cryptosystem allows the original decryptor to delegate his decryption capability to the proxy decryptor. Due to the extensive application of proxy cryptography, some schemes have been presented, but there are not a general model for proxy cryptography. In this paper, we give the first general model and security model for proxy-protected anonymous proxy cryptography in which only the proxy decryptor can decrypt the ciphertexts for the original decryptor. Finally we give one concrete scheme according to the model as example.
['Guoyan Zhang']
A Generic Construction for Proxy Cryptography