Question

1. Using a ROT5 cipher encrypt the following plaintext. Prove your answer by showing the steps for both the encryption and decryption. (20 points)

Meet at the baseball field at three oclock

2.

Using a ROT3 cipher decrypt the following ciphertext.

      WKHF RUYH WWHL VUHG

Answer 1

we have plain text
Meet at the baseball field at three oclock

After ROT5

Cipher text:

Rjjy fy ymj gfxjgfqq knjqi fy ymwjj thqthp

as adding 5 on M gives R similarly we can do it for all the letters

2)
Decrypting is also easy using ROT3, by reducing the letter by 3 places
so for example we have R as encrypted letter, then plain text is M

so to decrypt
WKHF RUYH WWHL VUHG

we have plain text is:
THEC ORVE TTEI SRED

as when reduced 3 letters from w we get t, similary we can decrypt other letters as well.

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