Part 1 (10 points) – Encryption/Decryption using Polyalphabetic Ciphers
Input
– A given text file for plaintext or ciphertext (assume only 26 letters, no special characters, numbers nor punctuations)
– 3 substitution ciphers, M1,M2,M3
M1 – left shift 3 letters
M2 – Plain: 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
Cipher: D K V Q F I B J W P E S C X H T M Y A U O L R G Z N
M3 – right shift 5 letters
– cycling pattern
• n=3: M2,M3,M2,M1,M3; M2,M3,M2,M1,M3;
Output
– Encrypted ciphertext or decrypted plaintext
See the requirements for submission
Part 2 (10 points) – Encryption/Decryption using Rail Fence Cipher
Input
– A given text file for plaintext or ciphertext
– A given depth of rail fence (not fixed, given by user at the time of execution)
Output
– Encrypted ciphertext or decrypted plaintext
See the requirements for submission
Requirements
You are given the flexibility to choose one of your favorite programming languages for implementation either in Windows or Linux environment.
You must submit
all the source code of your program
executable files (if use c/c++)
Makefile (if use c/c++)
ReadMe file that describes
the use of your program
how to run it
You need to demonstrate your project in class on Jul. 2nd. Otherwise, 5 points out of total 20 points will be deducted from your project.
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