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提出了一个具有密文匿名性的前向安全的短签密方案,该方案可有效地保护密文收发方的身份隐私,并在随机预言机模型下证明了本方案具有语义安全性、不可伪造性、前向安全性、密文匿名性和公开验证性.在计算效率方面,签密过程只需要2个群标量乘运算,解密过程只需要2个双线性运算和1个群标量乘运算.与现有的短签密方案比较,新方案在安全性方面具有更强的安全性,且计算量小,密文长度短,更适合于带宽受限和签密收发双方身份保密的应用需求.
This paper proposes a forward-secure short-signcryption scheme with anonymity of ciphertext. This scheme can effectively protect the identity privacy of the ciphertext receiver. Under the random oracle model, it proves that this scheme is semantic secure and can not be forged Security, ciphertext anonymity and public verifiability.In terms of computational efficiency, the signing process requires only two scalar multiplication operations and the decryption process requires only two bilinear operations and one scalar multiplication operation Compared with the existing short signcryption scheme, the new scheme is more secure in terms of security and less computational load and shorter ciphertext length, which is more suitable for the application requirements of confidentiality of both bandwidth and signcryption .