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What (who) is identity-based cryptosystem - definition
![Narcissus]] gazing upon the water after falling in love with his own reflection.](https://commons.wikimedia.org/wiki/Special:FilePath/Narcissus-Caravaggio (1594-96) edited.jpg?width=200 "Narcissus]] gazing upon the water after falling in love with his own reflection.")
Wikipedia
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 encrypt a message using e.g. the text-value of the receiver's name or email address as a key. The receiver obtains its decryption key from a 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. He was however only able to give an instantiation of identity-based signatures. Identity-based encryption remained an open problem for many years.
The pairing-based Boneh–Franklin scheme and Cocks's encryption scheme based on quadratic residues both solved the IBE problem in 2001.
