Summary Day by Day data is increasingly, due to rapid development of data we need to specify some methods to protect our data from unauthorized users. For this we use encryption and decryption techniques and studying different methods. These Notes cover all basic

Information Security

Mamoona Jabbar

, Security Principles
• Security refers to secure your information from any
unauthorized access or any kind of loss.

• To make any system, requirement gathering is important.

• Security is a system requirement just like performance,
capability, cost, etc. Therefore, it may be necessary to trade off
certain security requirements to gain others
• These requirements are directly proportional to each other.

, Security Principles


• A trade off is a situational decision that involves diminishing or
losing one quality, quantity or property of a set or design in
return for gains in other aspects.
• A trade off is where one thing increases and another must
decrease.