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I’ve encrypted one file with des algorithm using openssl tool but I forgot my key .

Is there any way to recover that key or get any hint or something?

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    What would be the point of encrypting anything if it was trivially easy to guess the encryption key? Commented Aug 23, 2019 at 17:48

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Sure, a brute force attack trying every single combination of passwords should work...eventually. How much time do you have?

I presume you want to do this quickly, in which case the answer is almost certainly No there is no 'practical' way using the program and ciphertext/output.

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