All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info

Home > General > Cryptography
Succinct Start Schedule (Posted on 2009-01-19) Difficulty: 2 of 5
One of the methods used to encrypt a message is to use the message itself. We begin by providing a secret number that is used for the offset of the first letter and is known only to sender and receiver. This starting value is called a seed. For example, if we encode the word, CAT, we begin by finding the alphabetic value of each letter: 3, 1 and 20; and then use the value of the previous letter as an offset, with the first letter using the seed value.

Suppose the seed is 5:

C (3) (3 + 5[seed] = 8) H

A (1) (1 + 3[1st letter] = 4) D

T (20) (20 + 1[2nd letter] = 21) U

So the encoded message is HDU. It should be clear how, using the seed 5, it is possible to decode it easily.

Decode this message, without being told the seed:

X B M W W N B G C U A O O M W N W H C V R Y L S W A Q

See The Solution Submitted by K Sengupta    
No Rating

Comments: ( You must be logged in to post comments.)
  Subject Author Date
Solutionthe computer solutionCharlie2009-01-19 22:53:37
If I only had that machine!!rod hines2009-01-19 19:49:43
Modulo 26Andre2009-01-19 17:32:18
Hints/TipsIf only...Charlie2009-01-19 12:32:58
Please log in:
Login:
Password:
Remember me:
Sign up! | Forgot password


Search:
Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (7)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2017 by Animus Pactum Consulting. All rights reserved. Privacy Information