Use a two-stage transposition technique to encrypt the following message using the key “Decrypt”. Ignore the comma and the period in the message.

Description

Part A:

Use a two-stage transposition technique to encrypt the following message using the key “Decrypt”. Ignore the comma and the period in the message.

Message: “The Transposition cipher technique works by permuting the letters of the plaintext. It is not very secure, but it is great for learning about cryptography.”

In a 3–4 page summary, discuss the following:

Is it possible to decrypt the message with a different key? Justify your answer.

Do you agree with the statement of the message? Why or why not? Give at least two examples that support your view.

Part B:

Explain the following concepts in 3 paragraphs:

What is your understanding of the difference between a stream cipher and a block cipher?

What are two ways to launch a cryptanalytic attack against a cipher (based upon what the attacker knows or has in possession)? Be sure to provide detailed examples.

What is your understanding of the difference between an unconditionally secure cipher and a computationally secure cipher?

Your organization has asked for a cryptographic algorithm recommendation for a new project that requires high-level security. What algorithm would you recommend and why?