RC4 - определение. Что такое RC4
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Что (кто) такое RC4 - определение

STREAM CIPHER
RC4 Cipher; ARCFOUR; RC4 cipher; RC4 (cipher); Arcfour; Rc4; ARC4; RC4 decryption algorithm; Spritz (cipher); RC4 Keyspace; Arc4random; Key-scheduling algorithm

RC4         
Rivest Cipher / Ron#&39;s Code 4 (Reference: cryptography)
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 (http://pauillac.inria.fr/RC4doligez/ssl/)}, {rc4">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)}, {rc4-breaking">A collection of articles (http://cs.hut.fi/crypto/rc4-breaking)}. (1996-10-28)
Freecom         
  • Blinky, the mascot of FreeDOS
  • FreeDOS's default text editor—a clone of the [[MS-DOS Editor]], with added features
Freedos; FreeDos; Free DOS; Free-DOS; PD-DOS; FreeDOS 1.0; FreeDOS 1.1; FreeDOS 0.05; FreeDOS 0.1; FreeDOS 0.2; FreeDOS 0.3; FreeDOS 0.4; FreeDOS 0.5; FreeDOS 0.6; FreeDOS 0.7; FreeDOS 0.8; FreeDOS 0.9rc1; FreeDOS 0.9rc2; FreeDOS 0.9rc3; FreeDOS 0.9rc4; FreeDOS 0.9rc5; FreeDOS 0.9; FreeDOS 0.9sr1; FreeDOS 0.9sr2; FreeCOM; FreeDOS 1.2; FreeDOS 1.2 RC1; FreeDOS 1.2 RC2; FreeDOS 0.01; FreeDOS 0.02; FreeDOS 0.03; FreeDOS 0.04; FreeDOS 0.9 RC1; FreeDOS 0.9 RC2; FreeDOS 0.9 RC3; FreeDOS 0.9 RC4; FreeDOS 0.9 RC5; FreeDOS 0.9 SR1; FreeDOS 0.9 SR2; FreeDOS 0.06; Blinky (mascot); FreeCom; Morgan Toal; Hannibal Toal; FreeDOS 1.3 RC1; FreeDOS 1.3 RC2; FreeDOS 1.3 RC3; FreeDOS 1.3 RC4; FreeDOS 1.3 RC5; FreeDOS 1.3
Freecom is a German manufacturer of computer peripherals. Its products include USB hard disks (where the actual hard drive is manufactured by Samsung and others), USB flash drives, USB DVB-T television receivers and a data recovery service.

Википедия

RC4

In cryptography, RC4 (Rivest Cipher 4, also known as ARC4 or ARCFOUR, meaning Alleged RC4, see below) is a stream cipher. While it is remarkable for its simplicity and speed in software, multiple vulnerabilities have been discovered in RC4, rendering it insecure. It is especially vulnerable when the beginning of the output keystream is not discarded, or when nonrandom or related keys are used. Particularly problematic uses of RC4 have led to very insecure protocols such as WEP.

As of 2015, there is speculation that some state cryptologic agencies may possess the capability to break RC4 when used in the TLS protocol. IETF has published RFC 7465 to prohibit the use of RC4 in TLS; Mozilla and Microsoft have issued similar recommendations.

A number of attempts have been made to strengthen RC4, notably Spritz, RC4A, VMPC, and RC4+.