Attribute-based encryption: Difference between revisions

Revision as of 21:45, 15 June 2023

Revision as of 21:45, 15 June 2023

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'''Attribute-based encryption''' is a generalisation of [[public-key encryption]] which enables fine grained access control of encrypted data using [[Authorization | authorisation policies]]. The [[secret key]] of a user and the ciphertext are dependent upon attributes (e.g. their email address, the country in which they live, or the kind of subscription they have). In such ta system, the decryption of a ciphertext is possible only if the set of attributes of the user key matches the attributes of the ciphertext.<ref>{{cite web |title=What is Attribute-Based Encryption |work=Cryptography Stack Exchange |url=https://crypto.stackexchange.com/a/17894 |date=2014 }}</ref>

A crucial security aspect of attribute-based encryption is collusion-resistance: An adversary that holds multiple keys should only be able to access data if at least one individual key grants access.

==Description==