Editing RC4 (section)

==RC4-based protocols==
* [[Wired Equivalent Privacy|WEP]]
* [[Temporal Key Integrity Protocol|TKIP]] (default algorithm for [[Wi-Fi Protected Access|WPA]], but can be configured to use [[AES-CCMP]] instead of RC4)
* [[BitTorrent protocol encryption]]
* [[Microsoft Office XP]] (insecure implementation since nonce remains unchanged when documents get modified<ref>Hongjun Wu, "The Misuse of RC4 in Microsoft Word and Excel". https://eprint.iacr.org/2005/007</ref>)
* [[Microsoft Point-to-Point Encryption]]
* [[Transport Layer Security]] / [[Secure Sockets Layer]] (was optional and then the use of RC4 was prohibited in RFC 7465)
* [[Secure Shell]] (optionally)
* [[Remote Desktop Protocol]] (optionally)
* [[Kerberos (protocol)|Kerberos]] (optionally)
* [[Simple Authentication and Security Layer|SASL]] Mechanism Digest-MD5 (optionally, ''historic'', obsoleted in RFC 6331)
* [[Gpcode.AK]], an early June 2008 computer virus for Microsoft Windows, which takes documents hostage for [[ransom]] by obscuring them with RC4 and RSA-1024 encryption
* [[Portable Document Format|PDF]]
* [[Skype]] (in modified form)<ref>{{cite web
| url=http://www.h-online.com/security/news/item/Skype-s-encryption-procedure-partly-exposed-1034577.html
| archive-url=https://web.archive.org/web/20100711062958/http://www.h-online.com/security/news/item/Skype-s-encryption-procedure-partly-exposed-1034577.html
| archive-date=11 July 2010
| title=Skype's encryption procedure partly exposed
| publisher=www.h-online.com
| access-date=2010-07-08}}</ref>

Where a protocol is marked with "(optionally)", RC4 is one of multiple ciphers the system can be configured to use.