Level 2

Genesis of network security

in 1975 :

• AS400 with passive screens 5250 (in opposition to PC screens)
  - restricted park,
  - well controlled geographical implementation of the terminals
• security with applicative mode
  with a system menu the user cannot do everything, use restrictions
• + object-base security ("end car")

For 10 years, TCP/IP World Wide Web has been appeared such as services provided to LAN and process (daemons) which answer the external requests and do several things (clock update, but also files updating - on an IBM AS400-iSeries about thirty of these process are active at the starting of the machine)...

Non-exhaustive list of these daemons:

• FTP,
• Web servers,
• SMB files sharing (Windows),
• NFS files sharing (Unix)...
• What can the daemons do?

Before	Now
Passive screens	Active PC screens
Screens into dedicated areas => controlled security	Open on the whole world => set up a security