Information Technology

Because of the known risks of the UNIX password system, the SunOS-4.0 documentation recommends that the password file be removed and replaced with a publicly readable file called /etc/publickey. An entry in the file for user A consists of a user’s identifier IDA, the user’s public key, PUa, and the corresponding private key PRa. This private key is encrypted using DES with a key derived from the user’s login password Pa. When A logs in, the system decrypts E(Pa, PRa) to obtain PRa.

a. The system then verifies that Pa was correctly supplied. How?

b. How can an opponent attack this system?


Looking for help with your homework?
Grab a 30% Discount and Get your paper done!

30% OFF
Turnitin Report
Title Page
Place an Order

Grab A 14% Discount on This Paper
Pages (550 words)
Approximate price: -