The RC4 algorithm, as used in the TLS protocol and SSL protocol, has many single-byte biases, which makes it easier for remote attackers to conduct plaintext-recovery attacks via statistical analysis of ciphertext in a large number of sessions that use the same plaintext.

References

• http://blog.cryptographyengineering.com/2013/03/attack-of-week-rc4-is-kind-of-broken-in.html
• http://cr.yp.to/talks/2013.03.12/slides.pdf
• http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10705
• http://marc.info/?l=bugtraq&m=143039468003789&w=2
• http://my.opera.com/securitygroup/blog/2013/03/20/on-the-precariousness-of-rc4
• http://security.gentoo.org/glsa/glsa-201406-19.xml
• http://www.isg.rhul.ac.uk/tls/
• http://www.mozilla.org/security/announce/2013/mfsa2013-103.html
• http://www.opera.com/docs/changelogs/unified/1215/
• http://www.opera.com/security/advisory/1046

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