RC4


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RC4

(cryptography)
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, RC4 Source and Information, SSLeay, Crypto++, Ssh, A collection of articles.
References in periodicals archive ?
Figure 5 presents RC4, TripleDES, AES 128, AES 256, Salsa20 128 and Salsa20 256 data separately for better visibility.
A greater proportion of RC4 establishments had a routine inspection resulting in a critical violation.
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2011) to improve the strength of the key by using RC4 algorithm.
and Maitra (Indian Statistical Institute) introduce the RC4 software stream cipher for encrypting Internet traffic and assess the potential of byte-oriented variations, word-oriented variations, RC4-based hash, RC4 KSA+, RC4 PRGA+, and stream cipher HC-128.
RC4 (Rivest 1992), SEAL (Rogaway and Coppersmith 1998), etc.
It offers an extensive set of security options, which includes RC4, DES, triple DES, AES, & RSA that prevents spoofing and eavesdropping to ensure the integrity of the messaging system.
0 support, and crypto modules of RSA, DES, Triple-DES, RC2, RC4, MD2, MD5, SHA-1, and the HMAC algorithm.
Fast Packet Keying," a new technology based on the RC4 algorithm, is designed to help organizations securely fix the WEP encryption standard.
Based on the encryption methods of 1024 bit RSA, RC4 and 3DES, GateKeeper provides secure and affordable encryption with the added protection of smart card technology for computer users either at home or in the office.
The PowerCrypt Encryption Accelerator supports protocols such as DES, Triple DES, RC4, SHA-1 and MD5.