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Security Risks (Firewalls (Firewalls can be used to (Set which stations…

- - - - The sender or source IP address
      - The receiver or destination address
      - Port numbers
      - Protocols
- - - - The simple key moves each letter by 3 places in the alphabet (Hello would be Khoor because h-i-j-k)
      - To decrypt the message you just move the letters back 3 in the alphabet (k-j-i-h)
      - This would not be secure if used for sending data so instead programmers must create more complex algorithms. To make it even more secure they only transfer simple keys with public and private keys so when the message is received it checks to make sure that the public key used to send the data corresponds to the private key used to receive the data.