!!! Overview
In cryptography, [{$pagename}] (Rivest Cipher 4 also known as ARC4 or ARCFOUR meaning Alleged [{$pagename}], see below) is the most widely used software stream [Cipher] and is used in popular Internet protocols such as Transport Layer Security [TLS]. 

While remarkable for its simplicity and speed in software, [{$pagename}] has been termed [Cryptographically Weak] that and some argue against its use in new systems.

[RFC 7465] ([Prohibiting RC4 Cipher Suites]) declares [{$pagename}] as being  [PROHIBITED][{$pagename}] is especially vulnerable when the beginning of the output keystream is not discarded, or when nonrandom or related keys are used; some ways of using [{$pagename}] can lead to very insecure protocols such as WEP.

As of 2015, there is speculation that some state Cryptologic agencies may possess the capability to break [{$pagename}] even when used in the TLS protocol.

Mozilla and Microsoft recommend disabling [{$pagename}] where possible. 

[RFC 7465] prohibits the use of [{$pagename}] in [TLS].

!! More Information
There might be more information for this subject on one of the following:
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* [#1] - [RC4|Wikipedia:RC4|target='_blank'] - based on information obtained 2015-03-15