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 ?
In our study the root system accounted for 13 to 24% of total sugarcane biomass from PC to RC4.
The RC4 key is initialized by the key scheduling algorithm, and the pseudo-random number is produced by the PRGA.
The security of this encryption mechanism depends on the use of the stream cipher, and RC4 is a mature encryption mechanism [30].
WPA aborda las debilidades de la privacidad de los datos de WEP mediante la incorporacion del Protocolo de Integridad de Clave Temporal (TKIP), una implementacion mucho mas fuerte del algoritmo de cifrado RC4, ademas de un sofisticado sistema de claves dinamicas que mejora notablemente la privacidad de los datos y funciones de autenticacion.
Figure 7 presents RC4, Triple-DES, AES 128, AES 256, Salsa20 128 and Salsa20 256 data separately for better visibility.
Table 2 indicates that for RC4 establishments, the average number of days between routine inspections that resulted in critical violations was significantly greater than those that did not (p < .
The server will use the RC4 stream cipher and the session key that it shares with the client to encrypt the webpage content.
The final hashed value is an initial encryption key of RC4 stream cipher.
671 MBits/second compared to the RC4 encryption rate which is 152.
A partir de uma populacao original de 59 plantas RC4 [(Passiflora edulis x Passiflora setacea) x Passiflora edulis], foram selecionadas 17 plantas com base na resistencia a virose do endurecimento dos frutos.
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.
Fast Packet Keying," a new technology based on the RC4 algorithm, is designed to help organizations securely fix the WEP encryption standard.