High Quality Content by WIKIPEDIA articles! Cycles per byte (sometimes abbreviated cpb) is a unit of measurement which indicates the number of clock cycles a microprocessor will perform per byte (usually of octet size) of data processed in an algorithm. It is commonly used as a partial indicator of real-world performance in cryptographic functions. A microprocessor incorporates most or all of the functions of a computer's central processing unit (CPU) on a single integrated circuit (IC, or microchip). The first microprocessors emerged in the early 1970s and were used for electronic calculators, using binary-coded decimal (BCD) arithmetic in 4-bit words. Other embedded uses of 4-bit and 8-bit microprocessors, such as terminals, printers, various kinds of automation etc., followed soon after. Affordable 8-bit microprocessors with 16-bit addressing also led to the first general-purpose microcomputers from the mid-1970s on.

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