rc4 algorithm for audio steganography
#1

I want the algorithm of rc4 for audio steganography
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#2

In cryptography RC4 (Rivest Cipher 4 also known as ARC4 or ARCFOUR which stands for Presumptive RC4, see below) is a flow cipher. While notable for its simplicity and speed in software, multiple vulnerabilities have been discovered in RC4, making it unsafe. It is especially vulnerable when the start of the output key stream is not discarded or when non-random or related keys are used. Particularly problematic uses of RC4 have led to very insecure protocols such as WEP.

As of 2015, it is speculated that some state cryptographic agencies may have the ability to break RC4 when used in the TLS protocol. IETF has published RFC 7465 to ban the use of RC4 in TLS Mozilla and Microsoft have issued similar recommendations. In 2014, Ronald Rivest gave a talk and published a paper on an updated redesign called Spritz. A Spritz hardware accelerator was released in Secrypt, 2016. The authors have shown that because of multiple nested calls required to produce output bytes, Spritz behaves rather slowly compared to other hash functions like SHA-3 and implementation of known RC4 hardware.

RC4 was designed by Ron Rivest of RSA Security in 1987. Although officially referred to as "Rivest Cipher 4", the acronym RC is alternatively understood as the "Ron Code". RC4 was initially a trade secret, but in September 1994 an account was published anonymously on the Cypherpunks mailing list. Soon it was published in the newsgroup sci.crypt, where Bob Jenkins broke it in a matter of days. From there it spread to many sites on the Internet. It was confirmed that the filtered code was genuine since it was found that its result matched that of the proprietary software that uses licensed RC4. Because the algorithm is known, it is no longer a trade secret. The RC4 name is registered trademark, so RC4 is often referred to as ARCFOUR or ARC4 (ie, RC4 assumption) to avoid trademark issues. RSA Security never officially launched the algorithm; Rivest, however, has been linked to the Wikipedia article on RC4 in his own course notes in 2008 and has confirmed the story of RC4 and its code in a 2014 document.

RC4 became part of some commonly used encryption protocols and standards, such as WEP in 1997 and WPA in 2003/2004 for wireless cards; and SSL in 1995 and its successor TLS in 1999, until it was banned for all versions of TLS by RFC 7465 in 2015, due to RC4 attacks that weaken or break RC4 used in SSL / TLS. The key factors in the success of RC4 over such a wide range of applications have been its speed and simplicity: efficient implementations in both software and hardware were very easy to develop.
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