In cryptography, the socialist millionaire problem[1] is one in which two millionaires want to determine if their wealth is equal without disclosing any information about their riches to each other. It is a variant of the Millionaire's Problem[2][3] whereby two millionaires wish to compare their riches to determine who has the most wealth without disclosing any information about their riches to each other.
It is often used as a cryptographic protocol that allows two parties to verify the identity of the remote party through the use of a shared secret, avoiding a man-in-the-middle attack without the inconvenience of manually comparing public key fingerprints through an outside channel. In effect, a relatively weak password/passphrase in natural language can be used.
^Markus Jakobsson, Moti Yung (1996). "Proving without knowing: On oblivious, agnostic and blindfolded provers.". Advances in Cryptology – CRYPTO '96, volume 1109 of Lecture Notes in Computer Science. Berlin. pp. 186–200. doi:10.1007/3-540-68697-5_15.
^Andrew Yao (1982). "Protocols for secure communications" (PDF). Proc. 23rd IEEE Symposium on Foundations of Computer Science (FOCS '82). pp. 160–164. doi:10.1109/SFCS.1982.88.
^Andrew Yao (1986). "How to generate and exchange secrets" (PDF). Proc. 27th IEEE Symposium on Foundations of Computer Science (FOCS '86). pp. 162–167. doi:10.1109/SFCS.1986.25.
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