Week 1 Discussion Cipher.docx

Week 1 Discussion Cipher.docx - Jason Muessel CIS 313 H330...

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Jason Muessel 03/20/2018 CIS 313 – H330 Cryptography (2185-DD) Professor Gary Amerson Week 1 Assignment: Week 1 Discussion (cipher) Q1- Create your own version of a substitution cipher. The Cipher I choose was a Caesar Cipher and it will shift (13) times to the right. Here is the code: PBATENGHYNGVBAF LBH PENPXRQ GUR PBQR Key: A=N B=O C=P D=Q E=R F=S G=T H=U I=V J=W K=X L=Y M=Z N=A O=B P=C Q=D R=E S=F T=G U=H V=I W=J X=K Y=L Z=M Plaintext : A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Ciphertext : N O P Q R S T U V W X Y Z A B C D E F G H I J K L M Q2- Discuss some techniques that could be used to decipher a text encrypted by Caesar cipher. - Decryption would be easy to crack if the code reader realizes the shift pattern used and reverses it. - Frequency Analysis - Brute Force – several different models available. Hacking the Caesar Cipher with the Brute-Force Technique (March 2018) Q3- Which technique, from techniques discussed in Q2, would be most effective for a cryptanalyst to use to decrypt a text encrypted by Caesar cipher? Why?

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• Spring '17
• Doug Rausch
• Cryptography, GUR PBQR, LBH PENPXRQ GUR, PENPXRQ GUR PBQR

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