Editing Yarrow algorithm (section)

{{short description|Random number generator}}
{{More citations needed|date=November 2015}}
The '''Yarrow algorithm''' is a family of [[cryptographic pseudorandom number generator]]s (CSPRNG) devised by [[John Kelsey (cryptanalyst)|John Kelsey]], [[Bruce Schneier]], and [[Niels Ferguson]] and published in 1999. The Yarrow algorithm is explicitly unpatented, royalty-free, and open source; no license is required to use it. An improved design from Ferguson and Schneier, [[Fortuna (PRNG)|Fortuna]], is described in their book, ''Practical Cryptography''

Yarrow was used in [[FreeBSD]], but is now superseded by Fortuna.<ref name=bsd>{{cite web|url=https://svnweb.freebsd.org/base?view=revision&revision=284959|title=[base] Revision 284959|website=Svnweb.freebsd.org|access-date=18 October 2016}}</ref> Yarrow was also incorporated in iOS<ref>{{cite web|url=https://www.apple.com/br/ipad/business/docs/iOS_Security_Oct12.pdf |title=iOS Security |date=October 2012 |website=Apple.com |access-date=2016-10-21}}</ref> and [[macOS]] for their [[/dev/random]] devices, but Apple has switched to Fortuna since 2020 Q1.<ref>{{Cite web|title=Random number generation|url=https://support.apple.com/en-hk/guide/security/seca0c73a75b/web|access-date=2020-10-26|website=Apple Support|language=en}}</ref>