CryptIt 1.4
CryptIt - Most file encryptors use methods that rely on the theory of computational security, that is the
difficulty of key factorisation prevents decryption ofthe file. But this method may not work
forever. It used to be considered that a 56 bit key was unbreakable to brute force attacks, but the
government of the USA now requires all Top Secret data to use keys of at least 192 bits. This bar
will keep raising as computing power increases. (It is argued by some though that this will never
happen due to the laws of physics!) CryptIt is designed to use conventional XOR encryption on keys
that are the same size as the file to be encrypted. Furthermore, if you use an unpredictable file
that is the same size (or larger) than the original file and you use this file only once, this is
known as a one-time pad and it is completely unbreakable, even to computers 1000 years from now.
This is because there is no algorithm at all, just a big key, and thus there is no pattern to
follow once you have decrypted any part of the file. Thus attempts to decrypt it could result in
any file, and there would be no way to verify that it has decrypted correctly. CryptIt can also has
some convenience features such as being able to automatically use pad files generated by our program
GigAlarm, generate key files (from a stream cipher and thus not best for OTP usage) and also analyse
the suitability of your chosen key file.
CryptIt also has a ability to use removable
media (USB drives, CDs, floppies) as a key code book, further increasing the security and
convenience of the method. If your needs are more simpler then you can also use a word (string),
but the advantages of the XOR method are lost then. Descriptions can be stored within the encrypted
file, as well as the file name of the code. Command line operation is also supported and CryptIt is
written in Assembly Language for maximum efficiency.
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