Write a program in C# that does the following (it must be just do decrypt! It must be in C# given this is what requested in the assignment):

1. Decrypts a message using Ceaser cipher, Transposition cipher and Vignere Cipher. The encrypted strings and keys to be used are given below:
   1. Ceaser Cipher encrypted string = HDUILPGT HTRJGXIN XH WPGS
   2. Transposition Cipher encrypted string =

IEUBOIPI

NSCLFSOB

DTTETISL

ERASWMSE

1. Substitution Cipher encrypted string = SZXPVIH ZIV GVMZXRLFH
2. Vignere Cipher encrypted string = "LLGLV BQ QQHVG GF JUTSBLY "

Keys

• Ceaser Cipher: 15
• Transposition Cipher (4 lines, line = char_index mod 4)
• Substitution Cipher: ZYXWVUTSRQPONMLKJIHGFEDCAB
• Vignere Cipher: SECURITY

Vignere: "THERE TX SYDTM PX QWBOZRH "