Response | Technology cont’d

• Cryptography cont’d

  • Public-key encryption
    • Uses key pairs (math-related)
      • Public portion published
      • Private portion kept secret
    • Doesn’t require senders and receivers to exchange keys first
    • Much slower than private-key
  • Example
    • Authenticates the sender
      • Only the sender knows secret key corresponding to sender’s public key
    • Ensures confidentiality
      • Only intended receiver knows secret key corresponding to receiver’s public key
    • Note: Message digests more efficient