Because of the known risks of the unix password system the, Basic Computer Science

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Because of the known risks of the unix password system the

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, P_Ua, and the corresponding private key PRa.This private key is encrypted using DES with a key derived from the user's login password P_a. When A logs in, the system decrypts E(P_a, PR_a) to obtain PRa.

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

b. How can an opponent attack this system?

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