In internal networks, some encryption is necessary such as encryption pass words. These passwords are being sent from workstation to server at login. This is done automatically by many modern networks operating systems.


Some older network utilities such as ftp and telnet don’t have the ability to encrypt passwords.


Encryption is also used by many email systems .Third party softwares such as PGP, can provide data encryption for email systems that don’t have ability to to encrypt.

Encryption is also used for data transmission over VPN

( virtual private network)


Encryption is used to connect remote users securely to internal networks.

Finally encryption has become important with the advent of e- commerce and on line investing.


Buying products and handling finances would not be possible if the data sent between all involved parties over the internet were encrypted.


Thus encryption is directly related to Attack and Defense in key areas of security :

-Computer security

-Network Security

-Security policy

-Internet Security

-data and information security

-Wireless Security

-Software Security


-Firewall Security