Answer (C) is correct . Encryption technology converts data into code. Unauthorized users may still be able to access the data but, without the encryption key, they will be unable to decode the information.
Answer (A) is incorrect because Single-use passwords are a tool for permitting one-time access to a system.
Answer (B) is incorrect because A firewall is a combination of hardware and software that separates an internal network from an external network and prevents passage of certain types of traffic.
Answer (D) is incorrect because A digital signature is a means of verifying electronically that a certain party was the one who sent a given message.
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