Question

Cite examples from real life, where the following security objectives are needed: i. Confidentiality ii. Integrity iii. Non-repudiation Suggest suitable security mechanisms to achieve them.

Answer 1

Confidentiality:               
       It is basically the security of information from others.

Examples include:
Used to keeping secrets
Passwords security
Bank accounts
Documents

Suitable security mechanism to achieve this is by encryption. By this information remain secure and only those people can read this who are linked to it.

Integration:                 
It protects information from modification of unauthorized people.

Examples include:
Price of products
Results of students

Suitable security mechanism to achieve this is cryptography.

Non-repudiation:         
  It is basically an ability of a person to approve or disapprove something.

Examples include:
Forensic labs
IP addresses
Email

Suitable security mechanism to achieve this is email tracking