Quote:
Originally Posted by Ankh

Buy that book yourself, reverse engineer PC reader and decrypt the content using your own key. Obtain encrypted file purchased by other user. Brute force (or slightly more clever) attack will fairly quickly give you all the encryption keys that produce resulting (encrypted) file.
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I know that my credit card number is safe if it is not used as (a part of) an encryption key. ..
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Sheeh. See above.
And no, there are many other ways to get your credit card number as is demonstrated daily.