File Encryption

This is a discussion on File Encryption within the C++ Programming forums, part of the General Programming Boards category; Originally Posted by Jack Walters So, what if I wanted to use hashes to encrypt files? Only problem is, I ...

  1. #16
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    Quote Originally Posted by Jack Walters View Post
    So, what if I wanted to use hashes to encrypt files? Only problem is, I cant decrypt them.
    To me, hashes are a method to "checksum" a file to ensure it hasn't been tampered with. That can be used in conjunction with encryption if you want, e.g. in the encrypted file, add another x bytes that is the md5sum of the file [or whatever hash you want to use].

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    Okay, I just am familiar with hashes being used to encrypt passwords.

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    Quote Originally Posted by Jack Walters View Post
    Okay, I just am familiar with hashes being used to encrypt passwords.
    Yes, that's a common way to "store" passwords. Since the hashing method "looses" some data irretrievably, you can't just reverse calculate the value to get the original password.

    You could of course hash the password the user gives you and use that as the actual XOR key, for example.

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    Mats
    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

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