Message Authentication Codes

Basic goals of cryptography

What is cryptography?

• Internet

• Alice

• Bob

• M

• Adversary

What is cryptography?

• Internet

• Alice

• Bob

• M

• Adversary

What is encryption?

• Decryption

• Key exchange

• Plaintext to ciphertext

• Hashing

• Public key

What is a symmetric key algorithm?

• RSA

• AES

• Diffie-Hellman

• SHA-256

• MD5

What is a public key?

• Key used for encryption

• Key used for decryption

• Key shared publicly

• Key exchanged secretly

• Key for hashing

What is a hash function?

• Function for encryption

• Function for decryption

• Function for key exchange

• Function for data integrity

• Function for authentication

What is a digital certificate?

• Encrypted data

• Decrypted data

• Public key of a user

• Private key of a user

• Verification of sender's identity

What is a digital signature?

• Encryption of data

• Verification of data integrity

• Authentication of sender

• Decryption of data

• Key generation