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Informally, a message authentication code system consists of three algorithms: A key generation algorithm selects a key from the key space uniformly at random. A signing algorithm efficiently returns a tag given the key and the message. A verifying algorithm efficiently verifies the authenticity of the message given the key and the tag.
Asma al-Assad. Asma Fawaz al-Assad (born 11 August 1975) is the First Lady of Syria. Born and raised in London to Syrian parents, she is married to the 19th and current President of Syria, Bashar al-Assad.   Assad graduated from King's College London in 1996 with a bachelor's degree in computer science and French literature.
A physical system is said to exhibit nonlocality if operations carried out on one system influence the properties of some other, spatially separated system. This seems to me quite general, and does not necessarily pin the definition down to quantum correlations. The "influence" can be causal within this definition.
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