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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 RC4.
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/), RC4 Source and Information (http://cs.hut.fi/crypto/rc4), SSLeay (http://cs.hut.fi/crypto/software.html#ssleay), Crypto++ (http://cs.hut.fi/crypto/software.html#crypto++), Ssh (http://cs.hut.fi/crypto/software.html#ssh), A collection of articles (http://cs.hut.fi/crypto/rc4-breaking).


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  • RCA

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  • Rca 1802

    processor An extremely simple microprocessor fabricated in CMOS, running at 6.4 MHz at 10V (very fast for 1974). It could be suspended with the clock stopped. It was an 8-bit processor, with 16-bit addressing. Simplicity was the primary design goal, and in that sense it was one of the first RISC chips. It had sixteen […]

  • Rca 1805

    A later, enhanced version of the RCA 1802. It added several Forth language primitives. (1994-11-16)

  • Rcaf

    1. Royal Canadian Air Force. abbreviation 1. Royal Canadian Air Force Royal Canadian Air Force

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