Cyber Security Project 2: Symmetric Encryption/Decryption Solution

Description

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

1. You are given the flexibility to choose one of your favorite programming languages for implementation either in Windows or Linux environment.

2. You must submit

1. 1. all the source code of your program

1. 2. executable files (if use c/c++)

1. 3. Makefile (if use c/c++)

1. 4. ReadMe file that describes

1. 1. 1. the use of your program

1. 1. 2. how to run it

3. 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.

1