Cryptographic Modes of Operation

Scenario

The head of IT wants employees to send messages reliably with integrity and authenticity using hashing and digital signatures.

Company Requirements:

• Recipients should validate the sender's identity
• Recipients should verify message authenticity
• The process should be efficient and practical

Verifying Message Authenticity

System Admin: Charles and Dan use digital signatures to ensure message authenticity and integrity. Complete the process below.

1. Charles prepares the message and first... 2. Charles uses his private key to... 3. Charles sends the message along with... 4. Dan receives the message and uses Charles' public key to... 5. Dan hashes the received message and...