signcryption method and apparatus and a corresponding signcryption verification method and apparatus

摘要

PROBLEM TO BE SOLVED: To provide an encryption mechanism which provides both of the functions of signature and encryption.;SOLUTION: A signcryption is generated by a sender by: using a first encryption algorithm to encrypt (S1) plaintext m with public key Epk to get ciphertext e, e=E.Encrypt(m); generating (S2) a key k and its encapsulation c using an encapsulation algorithm and public key Kpk, k,c=KD.Encapsulate(); signing (S3) (e,c) using Ssk, s= S.sign(e,c); and encrypting (S4) the signature s using a second encryption algorithm and the key k, e_d=D.Encrypt(s). The signcryption of m is formed (S5) by (e,c,e_d). The sender may also prove (S11) knowledge of the decryption of e, and that e_d encrypts a valid signature on the concatenation of c and e using the key of the encapsulation.;COPYRIGHT: (C)2013,JPO&INPIT