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2 definitions found
 for RC4
From V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016) :

         Rivest Cipher / Ron's Code 4 (cryptography)

From The Free On-line Dictionary of Computing (30 December 2018) :

      A cipher designed by RSA Data Security,
     Inc. which can accept keys of arbitrary length, and is
     essentially a pseudo random number generator with the output
     of the generator being XORed with the data stream to produce
     the encrypted data.  For this reason, it is very important
     that the same RC4 key never be used to encrypt two different
     data streams.  The encryption mechanism used to be a trade
     secret, until someone posted source code for an algorithm
     onto Usenet News, claiming it to be equivalent to RC4.  The
     algorithm is very fast, its security is unknown, but breaking
     it does not seem trivial either.  There is very strong
     evidence that the posted algorithm is indeed equivalent to
     The United States government routinely approves RC4 with
     40-bit keys for export.  Keys this small can be easily broken
     by governments, criminals, and amateurs.  The exportable
     version of Netscape's Secure Socket Layer, which uses
     RC4-40, was broken by at least two independent groups.
     Breaking it took about eight days; in many universities or
     companies the same computing power is available to any
     computer science student.
     See also Damien Doligez's SSL cracking page
     http://pauillac.inria.fr/~doligez/ssl/)">(http://pauillac.inria.fr/~doligez/ssl/), RC4 Source and
     http://cs.hut.fi/crypto/rc4)">Information (http://cs.hut.fi/crypto/rc4), SSLeay
     http://cs.hut.fi/crypto/software.html#ssleay)">(http://cs.hut.fi/crypto/software.html#ssleay), Crypto++
     http://cs.hut.fi/crypto/software.html#crypto++)">(http://cs.hut.fi/crypto/software.html#crypto++), Ssh
     http://cs.hut.fi/crypto/software.html#ssh)">(http://cs.hut.fi/crypto/software.html#ssh), A
     collection of articles

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