Ideal Functionality
An ideal functionality is a protocol in which a trusted party that can communicate over perfectly secure channels with all protocol participants computes the desired protocol outcome. We say that a cryptographic protocol that cannot make use of such a trusted party fulfils an ideal functionality, if the protocol can emulate the behaviour of the trusted party for honest users, and if the view that an adversary learns by attacking the protocol is indistinguishable from what can be computed by a simulator that only interacts with the ideal functionality.
Read more about this topic: Universal Composability
Famous quotes containing the word ideal:
“Whoever has witnessed another’s ideal becomes his inexorable judge and as it were his evil conscience.”
—Friedrich Nietzsche (1844–1900)