New ECDSA-Verifiable Generalized Signcryption

Signcryption is a new cryptographic primitive that simultaneously fulfills both the functions of signature and encryption.The definition of generalized signcryption is proposed in the paper firstly.Generalized signcryption has a special feature that provides confidentiality or authenticity separately under specific inputs.So it is more useful than common ones.Based on ECDSA,a signcryption scheme called SC-ECDSA is designed.It will be equivalent to an AtE(OTP_($),MAC) encryption scheme or ECDSA when one of party is absent.A third party can verify the signcryption text publicly in the method of ECDSA.Security properties are proven based on Random Oracle mode: Confidentiality(CUF-CPA),unforgeability(UF-CMA) and non-repudiation.For typical security parameters for high level security applications,compared with the others,SC-ECDSA presents a 78% reduction in computational cost.