Last year, Microsoft announced that it would abandon the use in Edge and IE11 browser RC4 stream cipher encryption algorithm (RC4 stream cipher), and now, Microsoft has finally officially Edge (Windows 10), and Internet Explorer 11 (Windows 7 and higher) browser discontinued support for RC4 encryption algorithm
RC4 (Rivest password 4) by the Ron Rivest of RSA Security in 1987 design because of its speed and simplicity, this encryption algorithm has become the most widely used stream cipher. It is commonly used protocols, including Wired Equivalent Privacy (WEP), the algorithm used to secure wireless networks, HTTPS and Secure Sockets Layer (SSL) and Transport Layer Security (TLS) protocol; in fact, in all TLS traffic, about 50% of traffic currently using the RC4 algorithm to protect.
Currently attack Https protected web site theoretically require only 75 hours, but given the difficulty of application technology, the researchers decided to just issue a warning indicates that RC4 is not safe. Google Chrome browser, Mozilla Firefox, Opera browsers has been disabled in the previous update of the RC4 encryption, Microsoft said users should not notice the difference after using the disabled, because now there are few network service is no longer safe to use RC4 stream cipher encryption algorithm.