List of Figures

• The Network Virtual Terminal concept
• Enabling an option
• Sub-negotiation
• Passive attack
• Active attack
• 8 bit Cipher Feedback Mode
• Authentication information exchange
• Secure Telnet Environment
• Typical PGP authentication procedure
• Possible placements of the encryption/decryption module
• Modified CFB mode
• Example of a session with encryption
• Data stream with integrity information
• Placement of the integrity block