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Do not use the phrase but just one word as the answer.

Maybe you could remove the phrase from your above post to keep the challenge for other users.

Using rainbow tables helped in reversing the md5 hash.

I guess the smartest idea is a simple rewrite as a non-recursive function.

I think donster's post is giving to much hint on solving the challenge. Maybe the post should be censored.

Pretty simple indeed.

Another great example for "think before you code something"

tails wrote:no relation among the keys

Thanks a lot for clarifying this to me! Obviously i have mixed up the terms "cipher" and "key" (should have consulted a dictionary)...

tails wrote:guess the value of the four bytes.

So there is no relation to the other challenge mentioned except that both use XOR?

I don't exactly understand "the same cipher as in Didactic XOR 2" and how to turn it into a four-byte cipher. I have tried the answer to XOR 2, which is a word of n letters, taking the first four letters as cipher. But that didnt work. And i have tried the cipher from XOR 2, which is a sin...