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RC4: History, Description & Security

In cryptography, RC4 (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…

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RC4 topic overview

The analysis highlights History, Description and Security as prominent areas in the source structure around RC4.

Related topics
94
Source areas
6
Connected nodes
100
Extracted relationships
239
Concept neighborhoods
33
Bridge connections
100

What this topic covers Research coverage

Source areas are shown by the number of related topics found in each part of the analysis. Use smaller areas too: they can reveal specialized angles and content gaps.

Security · 30 topics
Description · 29 topics
History · 11 topics
Overview · 11 topics
RC4-based protocols · 10 topics
RC4 variants · 3 topics

Smaller areas are not necessarily less important. They contain fewer connections in this analysis and can be useful for finding specialized angles or coverage gaps.

Key facts & relationships

High-confidence facts extracted from structured source data. Use them as anchors for further research.

Designers
Ron Rivest (RSA Security)
First published
Leaked in 1994 (designed in 1987)
Key sizes
40–2048 bits
Rounds
1
Speed
7 cycles per byte on original Pentium Modified Alleged RC4 on Intel Core 2: 13.9 cycles per byte
State size
2064 bits (1684 effective)

Explore all related topics Closing gaps

Browse the complete topic structure, not only the most central items. Less prominent entities and concepts can reveal missing angles, specialized context and useful research gaps. Each item opens a new analysis centered on that subject.

Overview

History

Description

Security

RC4 variants

RC4-based protocols

Advanced semantic analysis

Deeper signals for content research, entity SEO and topical coverage. The plain-language headings explain what each technical view is useful for.

How RC4 connects Entity context

The extracted context around RC4 shows recurring relationship patterns in the source. For example, RC4 → Arcfour, Archived, Attacks, Attacks On RC4, CryptoBytes, Cypherpunks, Entry, Fall, February, Fluhrer, I-D, IETF, Improved Arcfour Modes, January, Key Scheduling Algorithm, Mantin, November, Original, PostScript, Prohibiting RC4 Cipher SuitesKaukonen Another extracted example is RC4 → According, ARC4, ARCFOUR, Because, Bob Jenkins, Cypherpunks, English Wikipedia, From, Internet, It, RC, RC2, RC5, RC6, Rivest, Ron's Code, Ronald Rivest, RSA Security, September, The. Use these groups to spot repeated connection types before inspecting the individual relationships.

RC4

Top relations

related to External links · 36
RC4 → Arcfour, Archived, Attacks, Attacks On RC4, CryptoBytes, Cypherpunks, Entry, Fall, February, Fluhrer, I-D, IETF, Improved Arcfour Modes, January, Key Scheduling Algorithm, Mantin, November, Original, PostScript, Prohibiting RC4 Cipher SuitesKaukonen
related to history · 20
RC4 → According, ARC4, ARCFOUR, Because, Bob Jenkins, Cypherpunks, English Wikipedia, From, Internet, It, RC, RC2, RC5, RC6, Rivest, Ron's Code, Ronald Rivest, RSA Security, September, The
related to Further reading · 17
RC4 → Algorithms, Applied Cryptography, Bruce, Chapter, CRC Press, Goutam, ISBN, Its Variants, Other Stream Ciphers, Paul, Protocols, RC4 Stream Cipher, Real Random-Sequence Generators, Schneier, Source Code, Subhamoy Maitra, Wiley
related to RC4-based protocols · 15
RC4 → AES-CCMP, BitTorrent, Kerberos, Microsoft Point-to-Point EncryptionTransport Layer, Office XP, PDFSkype, Remote Desktop Protocol, RFC, SASL Mechanism Digest-MD5, Secure Shell, Secure Sockets Layer, Security, WEPTKIP, Where, WPA
related to Fluhrer, Mantin and Shamir attack · 13
RC4 → Fluhrer, IEEE, If, In, Mantin, Protocols, RC4-drop, Shamir, Such, The SCAN, This, WEP, WPA
related to Security · 13
RC4 → Because RC4, Fluhrer, However, If, MAC, Mantin, One, RC4's, Shamir, The, This, Unlike, WEP
related to NOMORE attack · 11
RC4 → Dubbed, HTTP, In, KU Leuven, NOMORE, Numerous Occurrence MOnitoring, Recovery Exploit, The, Their, TLS, WPA-TKIP
related to Roos' biases and key reconstruction from permutation · 11
RC4 → Andrew Roos, Goutam Paul, In, KSA, Roos-type, Siddheshwar Rathi, Subhamoy Maitra, Subsequently, The, These, This
related to Klein's attack · 10
RC4 → Andreas Klein, Andrei Pychkine, Erik Tews, Fluhrer, In, Mantin, Ralf-Philipp Weinmann, Shamir, WEP, Whereas
related to RC4-based random number generators · 10
RC4 → API, ARC4, As, Man, OpenBSD, Random, Replacement Call, Several, The, The API

Important terminology

Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.

Important terminology

key stream used bytes keystream attack cipher algorithm output number tls also permutation use wep 256 mantin first state shamir

RC4 relationships Subject–Predicate–Object triples

TTTA extracted 239 structured relationships around RC4. Examples in this analysis include RC4 → Designers → Ron Rivest (RSA Security) and RC4 → First published → Leaked in 1994 (designed in 1987). The table shows each extracted connection, where it came from and its confidence.

SubjectPredicateObjectConfidenceSrc
RC4DesignersRon Rivest (RSA Security)1.00infobox
RC4First publishedLeaked in 1994 (designed in 1987)1.00infobox
RC4Key sizes40–2048 bits1.00infobox
RC4Rounds11.00infobox
RC4Speed7 cycles per byte on original Pentium Modified Alleged RC4 on Intel Core 2: 13.9 cycles per byte1.00infobox
RC4State size2064 bits (1684 effective)1.00infobox
RC4is astream cipher0.90text
the obsolete WEP protocol historically used to secure WiFi networks.There has long been speculation that some state cryptologic agencies may possess the capability to break RC4 when used in the TLS protocolinstance ofParticularly problematic uses of RC4 have led to insecure protocols0.80text
SHA-3instance ofSpritz performs rather slowly compared to other hash functions0.80text
the best known hardware implementation of RC4.Like other sponge functionsinstance ofSpritz performs rather slowly compared to other hash functions0.80text
Spritz can be used to build a cryptographic hash functioninstance ofSpritz performs rather slowly compared to other hash functions0.80text
a deterministic random bit generatorinstance ofSpritz performs rather slowly compared to other hash functions0.80text

Related concept clusters Concept neighborhoods

The concept neighborhoods around RC4 bring nearby vocabulary together. In this analysis, examples include Key, Cipher and Stream. Use the clusters to find adjacent concepts and terminology that may deserve separate research.

  • RC4
    • Key
    • Cipher
    • Stream
    • Number
    • Attacks
    • Tls
    • Output
    • Algorithm
    • Use
    • Mantin
    • Attack
    • Nonce
  • rc4
    • Key
    • Cipher
    • Stream
    • Number
    • Attacks
    • Tls
    • Output
    • Algorithm
    • Use
    • Mantin
    • Attack
    • Nonce
  • stream cipher
    • Stream
    • Mantin
    • Rc4
    • Attack
    • Number
    • Shamir
    • Ciphers
    • Encryption
    • State
    • Use
    • Algorithm
    • Known
  • key
    • Permutation
    • Rc4
    • Nonce
    • Bytes
    • First
    • Fluhrer
    • Shamir
    • Mantin
    • Keystream
    • Number
    • Used
    • Byte
  • key length
    • Permutation
    • Rc4
    • Nonce
    • Bytes
    • First
    • Fluhrer
    • Shamir
    • Mantin
    • Keystream
    • Number
    • Used
    • Byte
  • linear congruential pseudo-random number generator
    • Random
    • Rc4a
    • Rc4
    • Spritz
    • Algorithm
    • State
    • Use
    • Key
    • Bytes
    • Shamir
    • Mantin
    • Byte
  • fluhrer, mantin and shamir attack
    • Shamir
    • Mantin
    • Attack
    • Attacks
    • Tls
    • Fluhrer
    • Security
    • First
    • Cipher
    • Key
    • Wep
    • Random
  • bit-flipping attack
    • Mantin
    • Shamir
    • Tls
    • Fluhrer
    • Cipher
    • Used
    • Rc4
    • Security
    • Spritz
    • Stream
    • Using
    • Attacks

Connections between topic areas Semantic bridges

For RC4, one of the stronger structural bridges in this analysis connects RC4 with Security. Bridges highlight paths between different parts of the map and can reveal research angles that are easy to miss in a flat list.

Min side: 3
RC4 — Security · splits 70 ⟂ 31
RC4 — Description · splits 71 ⟂ 30
RC4 — Overview · splits 89 ⟂ 12
RC4 — History · splits 89 ⟂ 12
RC4 — RC4-based protocols · splits 90 ⟂ 11
RC4 — RC4 variants · splits 97 ⟂ 4

Map overview Semantic statistics

RC4

Nodes101
Edges100
Triples239
Avg. degree1.98
Density0.019802
Components1

Source & methodology

TTTA analyzes the structure around RC4 to surface related topics, entities, relationships, concept neighborhoods and bridge connections. Use the map to explore areas such as History, Description & Security, including less central topics that may reveal useful research gaps. Automatically extracted connections are research leads rather than rewritten encyclopedia content.

Source: Wikipedia — RC4 · EN edition · Analysis: TopicsToTalkAbout

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