1. Maintaining State in a Stateless System
Use your script to write data to a temporary file on the server and to start each time by reading any data in that file
Use JavaScript to process activities in a given session and send results to server at end only
Hide data in forms and send it back and forth
Keep everything in a database
Use Servlets
GETS TRICKY!!

2. Hidden Fields … <FORM NAME="Form1">
<INPUT TYPE= "HIDDEN" NAME= "Shirt1" VALUE="25">
<INPUT TYPE= "CHECKBOX" NAME= "Check1">Blue Cotton Shirt
<br>
<INPUT TYPE= "HIDDEN" NAME= "Shirt2" VALUE="26">
<INPUT TYPE= "CHECKBOX" NAME= "Check2" >Green Cotton Shirt
<INPUT TYPE= "HIDDEN" NAME= "Shirt3" VALUE="27">
<INPUT TYPE= "CHECKBOX" NAME= "Check3">White Silk Shirt ….
<P>
<INPUT TYPE="submit" NAME="Go" VALUE="Register!">
<INPUT TYPE="RESET" VALUE="Reset!">
</FORM>

3. 1-Tier Architecture Processing
Main Frame

4. 1-Tier Architecture Processing
1-Ask for file
Client
Files
2-File
4-return file
File Server

5. Two Tiers Web Server Web Client User HTTP request
Response to HTTP request
Web Server
Web Client

6. Tier 2 Tier 3 Tier 1 2 HTTP request 1 HTTP request 3 TCP/IP internet 4
DBMS
Web Server
Tier 2
Tier 3
Web Client
Tier 1

7. Operating Systems For Web Servers
Microsoft Windows NT Server
Microsoft Windows 2000 Advanced Server
Microsoft.NET Server
Linux
Solaris

8. Web Server Software Apache HTTP Server
Microsoft Internet Information Server (IIS)
Sun ONE (iPlanet, Netscape) Web Server

9. A catalog display
Shopping cart capabilities
Transaction processing

10. Middleware
Application integration
Web services
Integration with ERP software
Supply chain management software
Customer relationship management software
Content management software
Knowledge management Software

11. E-commerce Software Intershop Enfinity
WebSphere Commerce Professional Edition
Microsoft Commerce Server 2002

12. Back Doors And Trojan Horses

13. Virus Protection
Install anti-virus software – McAfee, Norton, Dr. Solomon, Symantec
Downloading of plug-ins from the internet be avoided
Downloading of plug-ins should be done from the vendor’s official website
Newly obtained disks, programs or files should be scanned for viruses before use
Installation of a firewall may also reduce the risk of virus infiltration

14. Outside Attacks On A Network
Eavesdropping/Sniffing/Snooping – ability to monitor network traffic using some kind of network-monitoring software
Password Attacks – attacker is able to gain access to the network and gather information such as valid users, computer names, resources – can lead to modification, deletion or rerouting of network data
IP Address Spoofing – attacker assumes a legal IP address and gain access to the network
Man-in-the–middle attacks – attacker is able to monitor, capture and control data between sending and receiving devices

15. Firewalls
A combination of hardware and software that sits between the internet and the internal network
Protects a network from outside attack
A firewall examines data leaving and entering the internal network and is able to filter the data according to the specified rules

16. Internet
Fire wall
Organization network

17. Types of Firewalls Packet Filter Firewall Circuit-Level Firewall
Application-Gateway Firewall