Message signing using asymmetric keys — Quiz

Message signing using asymmetric keys

1. What is the primary cryptographic function used to ensure that a message has not been altered before it is signed? (Choose one answer) a) Encryption with the sender's public key b) Generation of a cryptographic hash c) Encryption with the recipient's private key d) Decryption with the sender's public key

2. For message signing, which key does the sender use to create the digital signature? (Choose one answer) a) The recipient's public key b) The recipient's private key c) The sender's private key d) The sender's public key

3. If Bob successfully verifies a message signature using Alice's public key, which of the following security properties is NOT guaranteed? (Choose one answer) a) Message Integrity b) Authentication of the sender c) Confidentiality of the message d) Non-repudiation

4. The process of "encrypting the hash" is technically not classic encryption. Why is this distinction important? (Choose one answer) a) Because it uses a different mathematical operation that is impossible to reverse. b) Because the goals of signing (authentication/integrity) are different from the goals of encryption (confidentiality). c) Because only hashing algorithms are used, not encryption algorithms. d) Because it requires the use of a symmetric key instead of an asymmetric key.

5. Which of the following algorithms is explicitly mentioned in the discussion as being deprecated and should be considered legacy? (Choose one answer) a) RSA-PSS b) ECDSA c) EdDSA d) DSA