Question

I have two ciphertexts, I suppose that its RC4 with reused key. I have XORed both...

I have two ciphertexts, I suppose that its RC4 with reused key. I have XORed both ciphertexts and obtained message containing combined cleartexts.

I suppose that the underlaying messages are written in some structured format, but unfortuanatelly I do not know anything about frequencies (I might guess that there will be eg plenty of { }, if its json).

Most sources that I have read state that the separation is simple, but do not discuss the method to separate the texts. My idea was to use backtracking algorithm and try to construct both messages, so their sum (xor) matches the known combined text.

Is this the correct solution to this issue, or is there some smarter way? I'm also sure that I am not the first programmer solving this issue, so if you can point me to some implementation or library (prefferably in Java), I will be gratefull.

Thanks.

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