BuyFindarrow_forward

Discrete Mathematics With Applicat...

5th Edition
EPP + 1 other
ISBN: 9781337694193

Solutions

Chapter
Section
BuyFindarrow_forward

Discrete Mathematics With Applicat...

5th Edition
EPP + 1 other
ISBN: 9781337694193
Textbook Problem
5 views

In 36,37,39 and 40, use the RSA cipher with public key and In 36 and 37, encode the messages into their numeric equivalents and encrypt them. In 39-40, decrypt the given cipher text and find the original messages.

675 089 089 048

To determine

To decrypt the given cipher text and calculate the original message:

675089089048.

Explanation

Given information:

The given cipher text 675089089048.

Concept used:

Inverse of amodulon: For all integers aandn, if gcd(a,n)=1, then there exists an integer s

such that as1(modn). The integer s is called the inverse of amodulon.

Calculation:

Consider the cipher text,

675089089048

The objective is to decrypt the given cipher text and find the original message.

The decryption key is d=307, since 307 is the inverse of 43.

Public key is n=713=2331 and e=43.

Thus, to decrypt the message, compute the following:

675307mod713,89307mod713,89307mod713,48307mod713

Convert 307 to a sum of powers of 2.

307=256+32+16+2+1=28+25+24+21+1

Perform 6752kfork=1,2,3,4.

675675(mod713)6752455625(mod713)since 6752=455625=18mod713since455625mod713=18

6754( 675 2)2mod713182mod713since6752mod713=18=324mod713since182=324

6758( 675 4)2mod713(324)2mod713since 6754mod713=324104976mod713since 3242=104976165mod713since 104976mod713=165

67516( 675 8)2mod713(165)2mod713since6758mod713=16527225mod713since1652=27225131mod713since27225mod713=131

Perform 6752kfork=5,6,7,8

67532( 675 16)2mod713(131)2mod713since67516mod713=13117161mod713since1312=1716149mod713since17161mod713=49

67564( 675 32)2mod713(49)2mod713since67532mod713=492401mod713since492=2401262mod713since2401mod713=262

675128( 675 64)2mod713(262)2mod713since67564mod713=26268644mod713since2622=68644196mod713since68644mod713=196

675256( 675 128)2mod713(196)2mod713since675128=196mod17338416mod713since1962=38416627mod713since38416mod713=627

Use the fact that

675307mod173=( 675 256+32+16+8+2+1)mod173=( 675 256 675 32 675 16 6752 6751)mod173=(6274913118675)mod173=48900262950mod173=3mod173using calculator=3

Thus, 675 is decrypted as 3, which corresponds to letter C.

Calculate 892kfor k=1,2,3,4.

8989mod713since by aa(modn)892892mod713=7921mod713since 892=7921=78mod713since 7921mod713=78

894( 89 2)2mod713(78)2mod713since892mod713=786084mod713since782=6084=380mod713since380=6084mod713

898( 89 4)2mod713(380)2mod713since894mod713=380144400mod713since3802=144400=374mod713

8916( 89 8)2mod713(374)2mod713since898mod713=374139876mod713since3742=139876=128mod713since139876mod713=126

Perform 892kfor k=5,6,7,8

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started
Sect-8.1 P-6ESSect-8.1 P-7ESSect-8.1 P-8ESSect-8.1 P-9ESSect-8.1 P-10ESSect-8.1 P-11ESSect-8.1 P-12ESSect-8.1 P-13ESSect-8.1 P-14ESSect-8.1 P-15ESSect-8.1 P-16ESSect-8.1 P-17ESSect-8.1 P-18ESSect-8.1 P-19ESSect-8.1 P-20ESSect-8.1 P-21ESSect-8.1 P-22ESSect-8.1 P-23ESSect-8.1 P-24ESSect-8.2 P-1TYSect-8.2 P-2TYSect-8.2 P-3TYSect-8.2 P-4TYSect-8.2 P-5TYSect-8.2 P-6TYSect-8.2 P-7TYSect-8.2 P-8TYSect-8.2 P-9TYSect-8.2 P-10TYSect-8.2 P-1ESSect-8.2 P-2ESSect-8.2 P-3ESSect-8.2 P-4ESSect-8.2 P-5ESSect-8.2 P-6ESSect-8.2 P-7ESSect-8.2 P-8ESSect-8.2 P-9ESSect-8.2 P-10ESSect-8.2 P-11ESSect-8.2 P-12ESSect-8.2 P-13ESSect-8.2 P-14ESSect-8.2 P-15ESSect-8.2 P-16ESSect-8.2 P-17ESSect-8.2 P-18ESSect-8.2 P-19ESSect-8.2 P-20ESSect-8.2 P-21ESSect-8.2 P-22ESSect-8.2 P-23ESSect-8.2 P-24ESSect-8.2 P-25ESSect-8.2 P-26ESSect-8.2 P-27ESSect-8.2 P-28ESSect-8.2 P-29ESSect-8.2 P-30ESSect-8.2 P-31ESSect-8.2 P-32ESSect-8.2 P-33ESSect-8.2 P-34ESSect-8.2 P-35ESSect-8.2 P-36ESSect-8.2 P-37ESSect-8.2 P-38ESSect-8.2 P-39ESSect-8.2 P-40ESSect-8.2 P-41ESSect-8.2 P-42ESSect-8.2 P-43ESSect-8.2 P-44ESSect-8.2 P-45ESSect-8.2 P-46ESSect-8.2 P-47ESSect-8.2 P-48ESSect-8.2 P-49ESSect-8.2 P-50ESSect-8.2 P-51ESSect-8.2 P-52ESSect-8.2 P-53ESSect-8.2 P-54ESSect-8.2 P-55ESSect-8.2 P-56ESSect-8.3 P-1TYSect-8.3 P-2TYSect-8.3 P-3TYSect-8.3 P-4TYSect-8.3 P-5TYSect-8.3 P-6TYSect-8.3 P-1ESSect-8.3 P-2ESSect-8.3 P-3ESSect-8.3 P-4ESSect-8.3 P-5ESSect-8.3 P-6ESSect-8.3 P-7ESSect-8.3 P-8ESSect-8.3 P-9ESSect-8.3 P-10ESSect-8.3 P-11ESSect-8.3 P-12ESSect-8.3 P-13ESSect-8.3 P-14ESSect-8.3 P-15ESSect-8.3 P-16ESSect-8.3 P-17ESSect-8.3 P-18ESSect-8.3 P-19ESSect-8.3 P-20ESSect-8.3 P-21ESSect-8.3 P-22ESSect-8.3 P-23ESSect-8.3 P-24ESSect-8.3 P-25ESSect-8.3 P-26ESSect-8.3 P-27ESSect-8.3 P-28ESSect-8.3 P-29ESSect-8.3 P-30ESSect-8.3 P-31ESSect-8.3 P-32ESSect-8.3 P-33ESSect-8.3 P-34ESSect-8.3 P-35ESSect-8.3 P-36ESSect-8.3 P-37ESSect-8.3 P-38ESSect-8.3 P-39ESSect-8.3 P-40ESSect-8.3 P-41ESSect-8.3 P-42ESSect-8.3 P-43ESSect-8.3 P-44ESSect-8.3 P-45ESSect-8.3 P-46ESSect-8.3 P-47ESSect-8.4 P-1TYSect-8.4 P-2TYSect-8.4 P-3TYSect-8.4 P-4TYSect-8.4 P-5TYSect-8.4 P-6TYSect-8.4 P-7TYSect-8.4 P-8TYSect-8.4 P-9TYSect-8.4 P-10TYSect-8.4 P-1ESSect-8.4 P-2ESSect-8.4 P-3ESSect-8.4 P-4ESSect-8.4 P-5ESSect-8.4 P-6ESSect-8.4 P-7ESSect-8.4 P-8ESSect-8.4 P-9ESSect-8.4 P-10ESSect-8.4 P-11ESSect-8.4 P-12ESSect-8.4 P-13ESSect-8.4 P-14ESSect-8.4 P-15ESSect-8.4 P-16ESSect-8.4 P-17ESSect-8.4 P-18ESSect-8.4 P-19ESSect-8.4 P-20ESSect-8.4 P-21ESSect-8.4 P-22ESSect-8.4 P-23ESSect-8.4 P-24ESSect-8.4 P-25ESSect-8.4 P-26ESSect-8.4 P-27ESSect-8.4 P-28ESSect-8.4 P-29ESSect-8.4 P-30ESSect-8.4 P-31ESSect-8.4 P-32ESSect-8.4 P-33ESSect-8.4 P-34ESSect-8.4 P-35ESSect-8.4 P-36ESSect-8.4 P-37ESSect-8.4 P-38ESSect-8.4 P-39ESSect-8.4 P-40ESSect-8.4 P-41ESSect-8.4 P-42ESSect-8.4 P-43ESSect-8.5 P-1TYSect-8.5 P-2TYSect-8.5 P-3TYSect-8.5 P-4TYSect-8.5 P-5TYSect-8.5 P-6TYSect-8.5 P-7TYSect-8.5 P-8TYSect-8.5 P-9TYSect-8.5 P-10TYSect-8.5 P-1ESSect-8.5 P-2ESSect-8.5 P-3ESSect-8.5 P-4ESSect-8.5 P-5ESSect-8.5 P-6ESSect-8.5 P-7ESSect-8.5 P-8ESSect-8.5 P-9ESSect-8.5 P-10ESSect-8.5 P-11ESSect-8.5 P-12ESSect-8.5 P-13ESSect-8.5 P-14ESSect-8.5 P-15ESSect-8.5 P-16ESSect-8.5 P-17ESSect-8.5 P-18ESSect-8.5 P-19ESSect-8.5 P-20ESSect-8.5 P-21ESSect-8.5 P-22ESSect-8.5 P-23ESSect-8.5 P-24ESSect-8.5 P-25ESSect-8.5 P-26ESSect-8.5 P-27ESSect-8.5 P-28ESSect-8.5 P-29ESSect-8.5 P-30ESSect-8.5 P-31ESSect-8.5 P-32ESSect-8.5 P-33ESSect-8.5 P-34ESSect-8.5 P-35ESSect-8.5 P-36ESSect-8.5 P-37ESSect-8.5 P-38ESSect-8.5 P-39ESSect-8.5 P-40ESSect-8.5 P-41ESSect-8.5 P-42ESSect-8.5 P-43ESSect-8.5 P-44ESSect-8.5 P-45ESSect-8.5 P-46ESSect-8.5 P-47ESSect-8.5 P-48ESSect-8.5 P-49ESSect-8.5 P-50ESSect-8.5 P-51ES