关键词: 属性基, 签密, 常数长度, 多用户, 双线性对

Abstract: Aiming at the problem of linear ciphertext increase of current fuzzy-attribute based signcryption schemes with attribute number, a fuzzy attribute based signcryption scheme with constant length ciphertext is proposed. This scheme is constructed based on Lagrange interpolation formula and bilinear pairings. Signcrypter can signcrypt a message and send the resulting ciphertext to a set of users who own a designated attributes set, and ensure the secure properties, such as confidentiality and unforgeability of the message. Compared with current similar fuzzy attribute-based schemes, this scheme requires less computation resources. The ciphertexts length is constant in the scheme. Thus, it has better efficiency.

Key words: attribute-based, signcryption, constant length, multi-users, bilinear pairings