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Encryption on computers uses the same principle as encryption of messages over the ages. To crack modern computerized cryptography there are no short cuts. The encryption (scrambling the data) is done so that no extra information can be derived from the encrypted data. Each bit you add doubles the number of possible keys and hence doubles the amount of time it takes to try all possible keys, i.e. a brute force attack. The maximum possible decryption speed available today would be able to brute force a 64 bit key in a second.
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