Solved

RSA cryptosystem

Posted on 2010-11-28
4
940 Views
Last Modified: 2012-05-10
how to calculte RSA in the question below and how to found M

In a public-key system using RSA, you intercept the
 ciphertext C = 10 sent to a user whose
 public key is e = 5, n = 35. What is the plaintext M=.
0
Comment
Question by:G55
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
4 Comments
 
LVL 8

Accepted Solution

by:
thetmanvn earned 125 total points
ID: 34225306
Given e = 5, n = 35
Workings
Select p and q such that p*q = 35
As such, p = 5, q = 7
5d mod 24 == 1
d = 5 OR d = 29

Given C = 10
Workings
M = C5 mod 35  OR   C29 mod 35
M = 5
0
 

Author Comment

by:G55
ID: 34236550
thanks ,
0
 

Author Closing Comment

by:G55
ID: 34236557
the answer is very good
0
 
LVL 8

Expert Comment

by:thetmanvn
ID: 34236682
Tks, but just for curious, why it's marked a B grade?
0

Featured Post

What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Explore the encryption capabilities built into Google Apps and how these features can help you meet privacy policy and regulatory compliance, but are not a full solution. Understand and compare the most popular email encryption services for Google A…
There are many Password Managers (PM) out there to choose from. PM's can help with your password habits and routines, but they should not be a crutch you rely on too heavily. I also have an article for company/enterprise PM's.
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …

636 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question