## Cryptology ePrint Archive: Report 2008/276

Signcryption with Proxy Re-encryption

Chandrasekar S. and Ambika K. and Pandu Rangan C.

Abstract: Confidentiality and authenticity are two of the most fundamental problems in cryptography. Many applications require both confidentiality and authenticity, and hence an efficient way to get both together was very desirable. In 1997, Zheng proposed the notion of signcryption'', a single primitive which provides both confidentiality and authenticity in a way that's more efficient than signing and encrypting separately. Proxy re-encryption is a primitive that allows a semi-trusted entity called the proxy'' to convert ciphertexts addressed to a delegator'' to those that can be decrypted by a delegatee'', by using some special information given by the delegator, called the rekey''. In this work, we propose the notion of signcryption with proxy re-encryption (SCPRE), and motivate the same. We define security models for SCPRE, and also propose a concrete unidirectional, non-interactive identity-based SCPRE construction. We also provide complete proofs of security for the scheme in the security models defined. We finally provide directions for further research in this area.

Category / Keywords: public-key cryptography / signcryption, proxy re-encryption, identity-based cryptography

Date: received 16 Jun 2008

Contact author: prangan55 at gmail com

Available format(s): Postscript (PS) | Compressed Postscript (PS.GZ) | PDF | BibTeX Citation

Short URL: ia.cr/2008/276

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