Question

What is the advantage of including an actual encryption engine within the dongle?

a.

It becomes possible to hide the keys inside the dongle and there is never a need to expose the encryption keys to the untrusted CPU.

b.

It makes it easier to emulate the dongle.

c.

It eliminates the need for a device driver.

d.

It makes it possible to run the program without the dongle attached.

Posted under Reverse Engineering

Answer: (a).It becomes possible to hide the keys inside the dongle and there is never a need to expose the encryption keys to the untrusted CPU. Explanation:When the dongle actually has a microprocessor and is able to internally decrypt data, it becomes possible to hide the keys inside the dongle and there is never a need to expose the encryption keys to the untrusted CPU. Keeping the encryption keys safe inside the dongle makes it effectively impossible to emulate the dongle.

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