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A. 1 → B, 2 → C, 3 → D, 4 → A
B. 1 → D, 2 → B, 3 → C, 4 → A
C. 1 → C, 2 → A, 3 → B, 4 → D
D. 1 → A, 2 → D, 3 → B, 4 → C

B. 1 → D, 2 → B, 3 → C, 4 → A

Term	Description
1 Encryption	A Ensures authenticity and integrity of a message
2 Decryption	B Transforming ciphertext back into plaintext
3 Hashing	C Creating a fixed-size digest from data
4 Digital Signature	D Converting plaintext into ciphertext