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A new signcryption based on elliptic curve cryptosystems that combines ECDSA and PSCE-1 is presented. The signcryption scheme is a publicly verifiable scheme which can be verified by the third party after the specific recipient removes his key information. Analysis shows that the proposed scheme is secure against the adaptive chosen ciphertext attack. The(More)
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 the condition of specific inputs. So it is more(More)
Secure group communication is significant for wireless and mobile computing. Overheads can be reduced efficiently when a sender sends multiple messages to multiple recipients using multi-recipient signcryption schemes. In this paper, we proposed the formal definition and security model of multirecipient signcryption, presented the definition of reproducible(More)
Generalized signcryption is a novel cryptographic primitive, which provides encryption and authenticity services simultaneously or separately. The known schemes have the low communication performance and fail to deliver data stream. Based on bilinear pairing, an efficient generalized signcryption scheme with the shortened ciphertext called BPGSC is(More)
When a sender sends multiple messages to multiple recipients, overheads can be reduced efficiently by multi-recipient signcryption schemes. We proposed two multi-recipient signcryption schemes. The first scheme called SM-MR SCS (Single Message - Multiple Receivers SignCryption Scheme), which is an efficient broadcast signcryption scheme. The second scheme(More)