Question because of the known risks of the unix password, Ask an Expert

Engineering

Question: 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/public key. 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?

View complete question

Computer Engineering, Engineering

Category:- Computer Engineering
Reference No.:- M92651875

Have any Question?Write your Review or question?

Related Questions in Computer Engineering

As part of a bear population study data were gathered on a

As part of a bear population study, data were gathered on a sample of black bears in the western United States to examine the relationship between the Bear's neck girth (distance around the neck) and the weight of the be ...

Why software is important in our lifesearch the internet

Why Software is important in our life? Search the internet for "Why Software is important in our life" Read about this topic and write an essay of around 500 words and submit it.

What is the role of arp and how does it cause a security

What is the role of ARP and how does it cause a security concern? What is the different between global and private IP addresses? How does using NAT change a private IP address into a global IP address, and why is this so ...

Need help with calculation problem and design a program to

Need help with Calculation Problem and Design a program to input two numbers. Calculate the sum, the difference, the product, and the quotient. Display the answers. Car Rental Problem The Sports Car Rental Company rents ...

Assume a data histogram is bell shaped with an average of

Assume a data histogram is bell shaped with an average of 60 and standard deviation of 10. Using the Empirical Rule, approximately what percentage of data fall between 50 and 80?

Question suppose user process application p1 of one

Question : Suppose user process (application) P1 of one computer wishes to transfer data (file) to process (application) P2 on another computer in the Internet. What addressing information about P2 is necessary for P1 to ...

How social capital enhance well-being in high density

How Social Capital enhance well-being in high density community?

Suppose you insert 125 integer keys into a hash table with

Suppose you insert 125 integer keys into a hash table with an initial capacity of 25 and load factor threshold of 2. THe hash code is the key itself,and the function key mod table_capacity is used to map a key into a tab ...

Espn pays the nfl 11 billion per year for 8 yrs for the

ESPN pays the NFL $1.1 Billion per year for 8 yrs for the right to exclusively televise football. What is the NPV of the investment if the parent Disney CO has an opportunity interest rate that is equal to the cost of ca ...

Question pick a topic relevant to the information we have

Question: Pick a topic relevant to the information we have covered to date, including this week. It can cover information in Chapters 1,2,3, and 9, or any of the articles presented in the readings area. The format of you ...

4,153,160 Questions Asked
13,132 Experts
2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Recent Questions

Ask Computer Engineering Expert