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RC4
In cryptography, RC4 (also known as ARC4 or ARCFOUR) is the most widely-used software stream cipher and is used in popular protocols such as Secure Sockets Layer (SSL) (to protect Internet traffic) and WEP (to secure wireless networks). While remarkable in its simplicity, RC4 falls short of the high standards of security set by cryptographers, and some ways of using RC4 can lead to very insecure cryptosystems (including WEP).
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