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Paper 2003/163

Multipurpose Identity-Based Signcryption : A Swiss Army Knife for Identity-Based Cryptography

Xavier Boyen

Abstract

A combined Identity-Based Signature/Encryption system with multiple security properties is presented. The scheme allows Alice to sign a message and encrypt it for Bob ("confidentiality") in such a way that the ciphertext does not reveal anything about their identities ("anonymity"); upon receipt, Bob is convinced that he is Alice's intended addressee ("authentication") but is unable to prove this to a third party ("unlinkability"); nevertheless, the decrypted message bears a signature by Alice that anyone can verify ("non-repudiation"). The construction is based on the Bilinear Diffie-Hellman assumption, and proved secure in the random oracle model.

Note: Minor corrections.

Metadata
Available format(s)
PDF PS
Category
Public-key cryptography
Publication info
Published elsewhere. An extended abstract appears in CRYPTO 2003.
Keywords
ID-based cryptographysigncryptionmultiple security properties.
Contact author(s)
eprint @ boyen org
History
2004-02-26: last of 2 revisions
2003-08-11: received
See all versions
Short URL
https://ia.cr/2003/163
License
Creative Commons Attribution
CC BY
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