February 2020
Beginner
621 pages
19h 34m
English
book
Introduction to Cryptography with Coding Theory, 3rd Edition
by Wade Trappe, Lawrence C. Washington
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D.9 Computations for Chapter 18
Here is a game you can play. It is essentially the simplified version of poker over the telephone from Section 18.2.
There are five cards: ten, jack, queen, king, ace. They are shuffled and disguised by raising their numbers to a random exponent mod the prime 24691313099. You are supposed to guess which one is the ace.
The cards are represented by ten = 200514, etc., because t is the 20th letter, e is the 5th letter, and n is the 14th letter.
Type the following into Sage. The value of forces the randomization to have 248 as its starting point, so the random choices of and shuffle do not change when we repeat the process with this value of . Varying gives different results.
cards=[200514,10010311,1721050514,11091407,10305] ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.