Turn on thread page Beta
    • Thread Starter

    Im a first year Mathematics student and we've been given this coursework to do for the module Numbers, Groups and Codes. We are using the computer software Maple. I don't know where to start! Any help?

    A public key code has base n = 564146777 and encoding exponent
    a = 282044381.
    (i) Factorise n and calculate (n).
    (ii) Calculate the decoding exponent x (i.e. a?1 mod (n)).
    (iii) Decode the following received message using the letter to number equivalents
    in the attached table (p.4). Each block corresponds to a sequence of two letters; thus,
    since 10 corresponds to A and 11 to B, 1011 stands for AB etc.

    Thank you!
Submit reply
Turn on thread page Beta
Updated: April 8, 2011

University open days

  1. University of Bradford
    University-wide Postgraduate
    Wed, 25 Jul '18
  2. University of Buckingham
    Psychology Taster Tutorial Undergraduate
    Wed, 25 Jul '18
  3. Bournemouth University
    Clearing Campus Visit Undergraduate
    Wed, 1 Aug '18
How are you feeling in the run-up to Results Day 2018?
Useful resources

Make your revision easier


Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here


How to use LaTex

Writing equations the easy way

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.