The MOST significant risk of this approach is:

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A company has decided to implement an electronic signature scheme based on public key
infrastructure. The user’s private key will be stored on the computer’s hard drive and protected by
a password. The MOST significant risk of this approach is:

A.
use of the user’s electronic signature by another person if the password is compromised.

B.
forgery by using another user’s private key to sign a message with an electronic signature.

C.
impersonation of a user by substitution of the user’s public key with another person’s public key.

D.
forgery by substitution of another person’s private key on the computer.

Explanation:
The user’s digital signature is only protected by a password. Compromise of the password would
enable access to the signature. This is the most significant risk. Choice B would require subversion
of the public key infrastructure mechanism, which is very difficult and least likely. Choice C would
require that the message appear to have come from a different person and therefore the true user’s
credentials would not be forged. Choice D has the same consequence as choice C.

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