Question

Why is reusing encryption keys considered a weakness?

a) It simplifies the encryption process
b) It improves non-repudiation
c) It enhances confidentiality
d) It can lead to vulnerabilities and compromise security

Answer 1

Reusing encryption keys is considered a weakness because it can lead to vulnerabilities and compromise security.

Step-by-step explanation:

Reusing encryption keys is considered a weakness because it can lead to vulnerabilities and compromise security. When the same key is used multiple times, it increases the chances of a successful attack because if one message is decrypted, all previous and subsequent messages encrypted with the same key can also be decrypted.

A common example is the use of the same encryption key for multiple sessions in a secure communication system. If an attacker is able to obtain the key for one session, they can decrypt all the messages sent during that session, compromising the confidentiality of the communication.

Using unique encryption keys for each session or message provides better security, as it ensures that even if one key is compromised, the attacker cannot decrypt other messages.