Use Of Substitution Ciphers And Transposition Ciphers

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Kaplan University
Unit 6
Jennifer Polisano

Question 6-1: Write a one half page description of the use of substitution ciphers and transposition ciphers. Use the rot13 encoding algorithm to encode the following sentence: It is critical for network administrators to understand cryptography.
There are several websites that will encrypt in rot13.

Answer 6-1: Substitution ciphers are a method of encryption by which units of plaintext are substituted with ciphertext according to a regular system; the "units" may be single letters (the most common), pairs of letters, triplets of letters, mixtures of the above, and so forth (WordNik, 2014). In other words, if you’re sending a message (plaintext) you want to keep secret, it can be transformed into an enciphered message (cipertext) using a different alphabet. The person receiving the message will then have to decrypt it. Transposition cipers are simple data encryption schemes in which plaintext characters are shifted in some regular pattern to form ciphertext (Gustavus, 2014). In other words, it’s a simpler way to send secret messages; however, it isn’t as secure and can be decrypted easily. For an example, I have encrypted the following phrase using rot13 encryption: “It is critical for network administrators to understand cryptography.” I was returned with: “Vg vf pevgvpny sbe argjbex nqzvavfgengbef gb haqrefgnaq pelcgbtencul”.

Question 6-2: Write a paragraph on each one of the following
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