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Cryptography

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    $\begingroup$ OpenSSL library supports any multiple of 8 bits key (i.e. integral bytes) for RC4 if you write a few lines of code to call it; it is the prewritten commandline utility openssl enc -$cipher alias openssl $cipher that supports only 40 and 128. And libssl also uses only 40 and 128 because those are the only published RC4 ciphersuites. $\endgroup$ Commented Nov 26, 2014 at 0:33