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Please help me with this homework because I cant understand the cipher text and plaintext


Brian Nguyen

 

IT 223

 

Summer 2016

 

Homework 2

 

07/03/2016

 

Cryptanalysis

 

IT 223 ? 29 points total

 


 

1. (9 points)

 

(a) Encrypt the following plaintext...

 

A page of history is worth a volume of logic.

 

F UFLJ TK MNXYTWD NX BTWYM F ATQZRJ TK QTLNH

 


 

(b) Decrypt the following ciphertext...

 

NURBKSUBVCGQKVEVGZVCBKCFU

 

fourscoreandsevenyearsago

 


 

(c) Decrypt the following ciphertext...

 

JSJRDKFQQNSLGFHPGWJFPYMWTZLMNRRNSJSYQZHNZX

 


 

enemyfallingbackbreakthroughimminentlucius

 


 

2. (15 points) Given the key: n+2, n-1, n+1, n-2 You would encrypt the following

 

word: ?Hello? this way: JDMJQ

 

Please encrypt the following sentence:

 

?We don?t walk in the dark, we are the dark.?

 

(N+2)

 

Yg fqpv ycnm kp vjg fctm, yg ctg vjg fctm

 

(N+1)

 

Xf epou xbml jo uif ebsl, xf bsf uif ebsl

 

(1 point) what sort of cipher does this represent?

 

Ceasar Cipher

 

?Frequency of letters occurring in the English language.?

 

(N+2)

 

Htgswgpea qh ngvvgtu qeewttkpi kp vjg Gpinkuj ncpiwcig.

 

(N+1)

 

Gsfrvfodz pg mfuufst pddvssjoh jo uif Fohmjti mbohvbhf

 

3. (2.5 points each)

 

Here is another encryption / decryption exercise. For this exercise, I have provided

 

a word that will serve as the key. You must figure out the key in order to complete

 

this section.

 

To get you started:

 

Easy = CCQA (Once you figure out the pattern to this you can do the following):

 

4a. Encrypt this plaintext:

 

I like information security.

 

iZdggej9QtMZj6VvepT5ih2+PADEknyGPFZNS32px3Y=

 

4b. Decrypt the following ciphertext:

 

GPDQQ GAKQH SP

 


 

 


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