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No, to the best of our knowledge, it is not possible, apart from a brute force search over all possible keys. RC4 has known cryptographical weaknesses; however, none of them are of much help in recovering the key, given a plaintext/ciphertext pair. There are backtracking approaches that might take circa $2^{700}$ effort independent of the key size; however ...


Take a look at this article it explains the IV can be publicly known once you have encrypted your data. Is using (and storing) a different iv for each file sufficient? (Am I correct in thinking that I'd need to store the iv with the encrypted data?) Yes, as a matter of fact i would not recommend using an IV twice, just for safety. Is this safe? ...

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