There are potential weaknesses in the implementation of the protocol between the dongle and the copy-controlled software. It requires considerable cunning to make this hard to crack. For example, a naïve implementation might simply define a function to check for the dongle, returning "true" or "false" accordingly, but the dongle requirement can be easily circumvented by modifying the software to always answer "true".
However, security researchers warn that dongles still do not solve the trusted client problem: if you give a user the cryptographic ciphertext, the algorithm and the key, your cipher is likely to be breakable, even with the algorithm and key encoded in hardware.[5]
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