Which of the following is a countermeasure to protect against impersonation attacks in public key cryptography?a.Using longer key lengthsb.Encrypting data with symmetric keysc.Changing private keys frequentlyd.Using digital signatures
Question
Which of the following is a countermeasure to protect against impersonation attacks in public key cryptography?a.Using longer key lengthsb.Encrypting data with symmetric keysc.Changing private keys frequentlyd.Using digital signatures
Solution
The correct answer is d. Using digital signatures.
Here's why:
a. Using longer key lengths: While this can make the encryption stronger and harder to break, it doesn't specifically protect against impersonation attacks.
b. Encrypting data with symmetric keys: This method of encryption doesn't provide a way to verify the identity of the sender, so it doesn't protect against impersonation attacks.
c. Changing private keys frequently: While this can help protect against some types of attacks, it doesn't specifically protect against impersonation attacks.
d. Using digital signatures: This is a method that can be used to verify the identity of the sender of a message or the signer of a document, and it is a countermeasure against impersonation attacks. A digital signature is a mathematical scheme for demonstrating the authenticity of digital messages or documents. A valid digital signature gives a recipient reason to believe that the message was created by a known sender (authentication), that the sender cannot deny having sent the message (non-repudiation), and that the message was not altered in transit (integrity).
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