Identity-based encryption: Difference between revisions

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'''ID-based encryption''', or '''identity-based encryption (IBE)''', is an important primitive of [[ID-based cryptography]]. As such it is a type of [[public-key encryption]] in which the [[public key]] of a user is some unique information about the identity of the user (e.g. a user's email address). This means that a sender who has access to the public parameters of the system can useencrypt a message using e.g. the text-value of the receiver's name or ___domainemail nameaddress as a key. orThe thereceiver physicalobtains IPits addresskey itfrom translatesa central authority, which needs to be trusted as it generates secret keys for every user.

ID-based encryption was proposed by [[Adi Shamir]] in 1984.<ref name="iseca.org">Adi Shamir, [http://www.iseca.org/modules/mydownloads/visit.php?cid=56&lid=33 Identity-Based Cryptosystems and Signature Schemes]. ''Advances in Cryptology: Proceedings of CRYPTO 84, Lecture Notes in Computer Science'', 7:47--53, 1984</ref> He was however only able to give an instantiation of [[ID-based cryptography|identity-based signatures]]. Identity-based encryption remained an open problem for many years.