Identity-based encryption: Difference between revisions

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{{Short description|Type of public-key encryption}}

'''Identity-based encryption''' ('''IBE'''), is an important primitive of [[identity-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.

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[[Dan Boneh]] and [[Matthew K. Franklin]] defined a set of four algorithms that form a complete IBE system:

* '''Setup''': This algorithm is run by the PKG one time for creating the whole IBE environment. The master key is kept secret and used to derive users' private keys, while the system parameters are made public. It accepts a [[security parameter]] <math>\textstyle k</math> (i.e. binary length of key material) and outputs:

# A set <math>\textstyle \mathcal{P}</math> of system parameters, including the [[message space]] and [[ciphertext space]] <math>\textstyle \mathcal{M}</math> and <math>\textstyle \mathcal{C}</math>,

# a master key <math>\textstyle K_m</math>.

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== External links ==

* [https://web.archive.org/web/20201020201238/https://www.crypto.ruhr-uni-bochum.de/lehre/ss14/cryptosem.html.en Seminar 'Cryptography and Security in Banking'/'Alternative Cryptology', Ruhr University Bochum, Germany]{{dead link|date=June 2020|bot=medic}}{{cbignore|bot=medic}}

* [https://web.archive.org/web/20170605075501/http://www.ietf.org/rfc/rfc5091.txt RFC 5091 - the IETF RFC defining two common IBE algorithms]

* [http://www.hpl.hp.com/techreports/2003/HPL-2003-21.pdf HP Role-Based Encryption] {{Webarchive|url=https://web.archive.org/web/20031212160232/http://www.hpl.hp.com/techreports/2003/HPL-2003-21.pdf |date=2003-12-12 }}

* [https://web.archive.org/web/20090416044556/http://www.larc.usp.br/~pbarreto/pblounge.html The Pairing-Based Crypto Lounge]

* [https://web.archive.org/web/20090628190353/http://www.voltage.com/vsn/ The Voltage Security Network - IBE encryption web service]