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Yarrow AlgorithmThe Yarrow algorithm is a cryptographically secure pseudo-random number generator. The name is taken from the yarrow plant, the stalks of which are dried and used as a randomising agent in I Ching divination. It was designed by Bruce Schneier, John Kelsey, and Niels Ferguson of Counterpane Labs (Kelsey et. al, 1999). The Yarrow algorithm is explicitly unpatented and royalty-free; no license is required to use it. Yarrow is incorporated in Mac OS X in its /dev/random device. An improved design from Ferguson and Schneier, Fortuna, is described in their book, Practical Cryptography. References - John Kelsey, Bruce Schneier, Niels Ferguson: Yarrow-160: Notes on the Design and Analysis of the Yarrow Cryptographic Pseudorandom Number Generator. Selected Areas in Cryptography 1999: pp13–33
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