Most file encryptors use methods that rely on the time taken in guessing the key number. Providing the key length is 128 bits or greater this method works well... for now. CryptIt uses a variant of Vernam encryption that can have keys the same size as the file to be encrypted. Thus, if you are encrypting a 5MB file, then you can have a 40 Million bit key! This is virtually unbreakable by any computer, especially when you consider that the file must also be checked with each combination to see if it is decrypted. Furthermore, the key file can be anything - a program, a swap file, an image of your cat or even a music file. |
