Message authentication code presentation.pptx

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1. Message authentication code Presented By Nitin D R

2. Message authentication Protecting the Integrity of the message. Validating identity of originator. Non-Repudiation of origin Method to Produce Authentication Message Encryption Message Authentication Code (MAC) Hash Function

3. Message Encryption Symmetric Message Encryption Public key Message Encryption

4. Message Authentication code We will use a secret key to generate a small fixed size block of data called MAC or Cryptographic checksum. It is then Appended to message as a signature. The communicating parties will share secret common key Receiver performs same computation on message and checks it matches the MAC. It calculate the MAC as a fn of the message and the key MAC = C(K,M)

5. M – Message K – Key M’ – MAC function with secret key SENDER RECEIVER Message Authentication code without Encryption Internet

6. Message Authentication code with encryption SENDER RECEIVER M – Message K – Key 1 K’ – Key 2 E – Encryption D – Decryption M’ – MAC function with secret key Internet

7. External error code SENDER RECEIVER M – Message K – Key 1 K’ – Key 2 E – Encryption D – Decryption M’ – MAC function with secret key C – Encrypted Message Internet

8. Hash – Message authentication code HMAC (Hash-based Message Authentication Code) is a type of a message authentication code (MAC) that is acquired by executing a cryptographic hash function on the data (that is) to be authenticated and a secret shared key. Like any of the MAC, it is used for both data integrity and authentication. Ipad = 00110110 Opad = 01011100

9. Thank You