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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 ...


0

The RC4 stream cipher does not mix the data into the key stream. The key stream it generates only depends on the secret key with which it was initialized. And "corruption", that means "flipped bits in the ciphertext" will result in "flipped bits in the cleartext" after decryption, even in exactly the same positions, as in the ciphertext, so classical ...


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If a large file enciphered using RC4 is partially corrupted, the uncorrupted portions remains fully decipherable, including what's after a corrupted portion if the corruption modifies this data's value, but not its length (a length corruption could occur e.g. for serial communication, but is unlikely on a hard disk). This is a property of all stream ciphers. ...



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