Match each cryptographic term to its correct definition: Terms: 1. Hashing 2. HMAC (Hash-based Message Authentication Code) 3. MD5 (Message Digest 5) Definitions: A. A keyed construction that uses a shared secret along with a hash function to verify both data integrity and authenticity B. A one-way mathematical function that converts arbitrary data into a fixed-length digest used to detect unauthorized changes C. A legacy hash function producing a 128-bit digest that is no longer considered secure due to collision vulnerabilities

### The pairs | Item | Matches | Why | |---|---|---| | Hashing | One-way transformation used to support integrity checks | Hashing produces a value that can be compared to help detect data changes. | | Hashed Message Authentication Code (HMAC) | A keyed hash-based mechanism that helps detect unauthorized message modification | The shared secret makes it harder for an outsider to create a valid authentication value. | | Message Digest 5 (MD5) | A hash algorithm the material says is no longer secure | The course explicitly warns against using it. | ### Terms - **Hashed Message Authentication Code (HMAC)**: a keyed mechanism based on hashing for message authentication and integrity. ### Remember A plain hash checks for differences; a keyed hash mechanism can add message authentication.