Information-theoretic security

A cryptosystem is considered to have information-theoretic security (also called unconditional security^[1]) if the system is secure against adversaries with unlimited computing resources and time. In contrast, a system which depends on the computational cost of cryptanalysis to be secure (and thus can be broken by an attack with unlimited computation) is called computationally, or conditionally, secure.^[2]

^ Diffie, Whitfield; Hellman, Martin E. (November 1976). "New Directions in Cryptography" (PDF). IEEE Transactions on Information Theory. IT-22 (6): 646. Retrieved 8 December 2021.
^ Maurer, Ueli (August 1999). "Information-Theoretic Cryptography". Advances in Cryptology — CRYPTO' 99. Lecture Notes in Computer Science. Vol. 1666. pp. 47–64. doi:10.1007/3-540-48405-1_4. ISBN 978-3-540-66347-8.

[1] Diffie, Whitfield; Hellman, Martin E. (November 1976). "New Directions in Cryptography" (PDF). IEEE Transactions on Information Theory. IT-22 (6): 646. Retrieved 8 December 2021.

[2] Maurer, Ueli (August 1999). "Information-Theoretic Cryptography". Advances in Cryptology — CRYPTO' 99. Lecture Notes in Computer Science. Vol. 1666. pp. 47–64. doi:10.1007/3-540-48405-1_4. ISBN 978-3-540-66347-8.

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