Public-key cryptography | Identity-based cryptography

Identity-based encryption

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. (Wikipedia).

Identity-based encryption
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Sakai–Kasahara scheme | Secure key issuing cryptography | Tate pairing | ElGamal encryption | Quadratic residue | Security parameter | Cocks IBE scheme | Certificate-based encryption | Pairing-based cryptography | Non-repudiation | Key escrow | Probabilistic encryption | Data integrity | Provable security | Quadratic residuosity problem | Identity-based conditional proxy re-encryption | Attribute-based encryption | Ciphertext expansion | Pairing | Public key infrastructure | Certificateless cryptography | Boneh–Franklin scheme | Weil pairing | Secret sharing | Shor's algorithm