Questions by ajaysoni1924 / GATE Overflow for GATE CSE

0 votes

1 answer

461

Andrew S. Tanenbaum Edition 5th Exercise 8 Question 22 (Page No. 873)
A math class has 25 students. Assuming that all of the students were born in the first half of the year—between January 1st and June 30th— what is the probability that at least two students have the same birthday? Assume that nobody was born on leap day, so there are 181 possible birthdays.

A math class has 25 students. Assuming that all of the students were born in the firsthalf of the year—between January 1st and June 30th— what is the probability that...

754 views

asked Mar 19, 2019

0 votes

0 answers

462

Andrew S. Tanenbaum Edition 5th Exercise 8 Question 33 (Page No. 874)
33. Two users can establish a shared secret key using the Diffie-Hellman algorithm, even if they have never met, share no secrets, and have no certificates (a) Explain how this algorithm is susceptible to a man-in-the-middle attack. (b) How would this susceptibility change if n or g were secret?

33. Two users can establish a shared secret key using the Diffie-Hellman algorithm, evenif they have never met, share no secrets, and have no certificates(a) Explain how ...

500 views

asked Mar 19, 2019

0 votes

1 answer

463

Andrew S. Tanenbaum Edition 5th Exercise 8 Question 32 (Page No. 874)
The Diffie-Hellman key exchange is being used to establish a secret key between Alice and Bob. Alice sends Bob (227, 5, 82). Bob responds with (125). Alice’s secret number, x, is 12, and Bob’s secret number, y, is 3. Show how Alice and Bob compute the secret key.

The Diffie-Hellman key exchange is being used to establish a secret key betweenAlice and Bob. Alice sends Bob (227, 5, 82). Bob responds with (125). Alice’ssecret numbe...

1.8k views

asked Mar 19, 2019

0 votes

0 answers

464

Andrew S. Tanenbaum Edition 5th Exercise 8 Question 25 (Page No. 873)
Alice wants to communicate with Bob, using public-key cryptography. She establishes a connection to someone she hopes is Bob. She asks him for his public key and he sends it to her in plaintext along with an X.509 certificate signed ... that Bob does not care who he is talking to (e.g., Bob is some kind of public service).

Alice wants to communicate with Bob, using public-key cryptography. She establishesa connection to someone she hopes is Bob. She asks him for his public key andhe sends i...

481 views

asked Mar 19, 2019

0 votes

1 answer

465

Andrew S. Tanenbaum Edition 5th Exercise 8 Question 18 (Page No. 873)
Alice and Bob use RSA public key encryption in order to communicate between them. Trudy finds out that Alice and Bob shared one of the primes used to determine the number n of their public key pairs. In other words, Trudy found out that na = pa × q and nb = pb × q. How can Trudy use this information to break Alice’s code?

Alice and Bob use RSA public key encryption in order to communicate between them.Trudy finds out that Alice and Bob shared one of the primes used to determine thenumber n...

1.1k views

asked Mar 19, 2019

1 votes

2 answers

466

Andrew S. Tanenbaum Edition 5th Exercise 8 Question 17 (Page No. 873)
Using the RSA public key cryptosystem, with a = 1, b = 2 . . . y = 25, z = 26. (a) If p = 5 and q = 13, list five legal values for d. (b) If p = 5, q = 31, and d = 37, find e. (c) Using p = 3, q = 11, and d = 9, find e and encrypt ‘‘hello’’.

Using the RSA public key cryptosystem, with a = 1, b = 2 . . . y = 25, z = 26.(a) If p = 5 and q = 13, list five legal values for d.(b) If p = 5, q = 31, and d = 37, find...

2.4k views

asked Mar 19, 2019

0 votes

0 answers

467

Andrew S. Tanenbaum Edition 5th Exercise 7 Question 32 (Page No. 761)
Write a program in JavaScript that accepts an integer greater than 2 and tells whether it is a prime number. Note that JavaScript has if and while statements with the same syntax as C and Java. The modulo operator is %. If you need the square root of x, use Math.sqrt (x).

Write a program in JavaScript that accepts an integer greater than 2 and tells whetherit is a prime number. Note that JavaScript has if and while statements with the same...

210 views

asked Mar 19, 2019

0 votes

0 answers

468

Andrew S. Tanenbaum Edition 5th Exercise 7 Question 46 (Page No. 762)
Some cybersquatters have registered domain names that are misspellings of common corporate sites, for example, www.microsfot.com. Make a list of at least five such domains.

Some cybersquatters have registered domain names that are misspellings of commoncorporate sites, for example, www.microsfot.com. Make a list of at least five such domains...

214 views

asked Mar 19, 2019

0 votes

0 answers

469

Andrew S. Tanenbaum Edition 5th Exercise 7 Question 47 (Page No. 762)
Numerous people have registered DNS names that consist of www.word.com, where word is a common word. For each of the following categories, list five such Web sites and briefly summarize what it is (e.g., www.stomach. ... , foods, household objects, and body parts. For the last category, please stick to body parts above the waist.

Numerous people have registered DNS names that consist of www.word.com, whereword is a common word. For each of the following categories, list five such Web sitesand brie...

333 views

asked Mar 19, 2019

0 votes

0 answers

470

Andrew S. Tanenbaum Edition 5th Exercise 7 Question 48 (Page No. 762)
Rewrite the server of Fig. 6-6 as a true Web server using the GET command for HTTP 1.1. It should also accept the Host message. The server should maintain a cache of files recently fetched from the disk and serve requests from the cache when possible.

Rewrite the server of Fig. 6-6 as a true Web server using the GET command for HTTP1.1. It should also accept the Host message. The server should maintain a cache offiles ...

184 views

asked Mar 19, 2019

0 votes

0 answers

471

Andrew S. Tanenbaum Edition 5th Exercise 7 Question 23 (Page No. 759)
Imagine that someone in the math department at Stanford has just written a new document including a proof that he wants to distribute by FTP for his colleagues to review. He puts the program in the FTP directory ftp/pub/forReview/newProof.pdf. What is the URL for this program likely to be?

Imagine that someone in the math department at Stanford has just written a new documentincluding a proof that he wants to distribute by FTP for his colleagues to review.H...

410 views

asked Mar 19, 2019

0 votes

0 answers

472

Andrew S. Tanenbaum Edition 5th Exercise 7 Question 23 (Page No. 759)
Although it was not mentioned in the text, an alternative form for a URL is to use the IP address instead of its DNS name. Use this information to explain why a DNS name cannot end with a digit.

Although it was not mentioned in the text, an alternative form for a URL is to use theIP address instead of its DNS name. Use this information to explain why a DNS nameca...

426 views

asked Mar 19, 2019

0 votes

1 answer

473

Andrew S. Tanenbaum Edition 5th Exercise 7 Question 20 (Page No. 759)
Does Webmail use POP3, IMAP, or neither? If one of these, why was that one chosen? If neither, which one is it closer to in spirit?

Does Webmail use POP3, IMAP, or neither? If one of these, why was that one chosen?If neither, which one is it closer to in spirit?

980 views

asked Mar 19, 2019

1 votes

0 answers

474

Andrew S. Tanenbaum Edition 5th Exercise 7 Question 15 (Page No. 759)
In any standard, such as RFC 5322, a precise grammar of what is allowed is needed so that different implementations can interwork. Even simple items have to be defined carefully. The SMTP headers allow white space between the tokens. Give two plausible alternative definitions of white space between tokens.

In any standard, such as RFC 5322, a precise grammar of what is allowed is needed sothat different implementations can interwork. Even simple items have to be definedcare...

365 views

asked Mar 19, 2019

0 votes

0 answers

475

Andrew S. Tanenbaum Edition 5th Exercise 7 Question 14 (Page No. 759)
Suppose that John just set up an auto-forwarding mechanism on his work email address, which receives all of his business-related emails, to forward them to his personal email address, which he shares with his wife. John' ... vacation daemon on his work machine. What happens when an email is received at John's work email address?

Suppose that John just set up an auto-forwarding mechanism on his work email address,which receives all of his business-related emails, to forward them to his personalema...

250 views

asked Mar 19, 2019

0 votes

1 answer

476

Andrew S. Tanenbaum Edition 5th Exercise 7 Question 10 (Page No. 759)
A large law firm, which has many employees, provides a single email address for each employee. Each employee's email address is <login>@lawfirm.com. However, the firm did not explicitly define the format of the login. ... for the email addresses of all its employees. How can this be done without rocking the boat too much?

A large law firm, which has many employees, provides a single email address for eachemployee. Each employee’s email address is <login>@lawfirm.com. However, thefirm did...

762 views

asked Mar 19, 2019

0 votes

0 answers

477

Andrew S. Tanenbaum Edition 5th Exercise 7 Question 9 (Page No. 759)
Electronic mail systems need directories so people’s email addresses can be looked up. To build such directories, names should be broken up into standard components (e.g., first name, last name) to make searching possible. Discuss some problems that must be solved for a worldwide standard to be acceptable.

Electronic mail systems need directories so people’s email addresses can be lookedup. To build such directories, names should be broken up into standard components(e.g....

415 views

asked Mar 19, 2019

0 votes

0 answers

478

Andrew S. Tanenbaum Edition 5th Exercise 7 Question 8 (Page No. 759)
Some email systems support a Content Return: header field. It specifies whether the body of a message is to be returned in the event of nondelivery. Does this field belong to the envelope or to the header?

Some email systems support a Content Return: header field. It specifies whether thebody of a message is to be returned in the event of nondelivery. Does this field belong...

456 views

asked Mar 19, 2019

0 votes

0 answers

479

Andrew S. Tanenbaum Edition 5th Exercise 7 Question 7 (Page No. 759)
The number of companies with a Web site has grown explosively in recent years. As a result, thousands of companies are registered in the com domain, causing a heavy load on the top-level server for this domain. ... introducing new top-level domain names). It is permitted that your solution requires changes to the client code.

The number of companies with a Web site has grown explosively in recent years. Asa result, thousands of companies are registered in the com domain, causing a heavyload on...

364 views

asked Mar 19, 2019

1 votes

0 answers

480

Andrew S. Tanenbaum Edition 5th Exercise 7 Question 3 (Page No. 759)
The number of companies with a Web site has grown explosively in recent years. As a result, thousands of companies are registered in the com domain, causing a heavy load on the top-level server for this domain. ... introducing new top-level domain names). It is permitted that your solution requires changes to the client code.

The number of companies with a Web site has grown explosively in recent years. Asa result, thousands of companies are registered in the com domain, causing a heavyload on...

344 views

asked Mar 19, 2019

tags	tag:apple
author	user:martin
title	title:apple
content	content:apple
exclude	-tag:apple
force match	+apple
views	views:100
score	score:10
answers	answers:2
is accepted	isaccepted:true
is closed	isclosed:true