[Information management][Data processing] Multiple choices ( 1 is correct each) please shortly explain it if possible, definitely thumbs up!

The term Nonreputation refers to: A secret code where the key encryption and decryption are the same A data Encryption standard Proving the identity of a user Making a transaction irrefutable QUESTION 7 : When we use the term integrity control we refer to: An algorithm that ensures the symmetry of the data stream An algorithm that ensures the completeness of information An algorithm that ensures the relevance of information An algorithm that ensures the accuracy of information QUESTION 8: A replay attack is: A cyber-attack where a valid message is retransmitted multiple times by the attacker A cyber-attack where an invalid message is retransmitted to the sender by the attacker A cyber-attack where an intercepted message is retransmitted multiple times by the attacker A cyber-attack where an invalid message is retransmitted multiple times by the attacker QUESTION 9: A One-time pad is: An encryption key the same length as the message and therefore is used only once. An encryption key that changes the length of the message and therefore is used only once. A decryption key shorter than the message and therefore is used only once. An encryption key larger than the message and therefore is used only once. QUESTION 10: The following statements are true for the Message Authentication Code: It's only known by both the recipient and the originator of the message It's a code added to a message that identifies the sender of the message. It's only known by the message recipient It's done by adding a shared secret key to the plaintext of a message