unbreakable cipher

unbreakable cipher

[¦ən′brāk·ə·bəl ′sī·fər]
(communications)
A cipher for which the message or key cannot be obtained through cryptanalysis, even with an unlimited amount of computational power, data storage, and calendar time.
Mentioned in ?
References in periodicals archive ?
He became a cryptographer for the US Government during the Second World War and helped develop the world's first unbreakable cipher. He loved to tinker with electronic switches and invented an electromechanical mouse which he called 'Theseus'.
It is proven that when the length of the message (in other words, if the rate at which the key can be transported) equals the data speed, the encryption performed on the message through a simple technique such as exclusive OR operation will be theoretically unbreakable cipher [11].