Explain the following concepts: What is your understanding of the difference bet

Question

Explain the following concepts: 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?

Explanation / Answer

Solution: -

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

Ans) Both stream and block cipher are the techniques that converts plain text into encrypted cipher text and both of these are symmetric key ciphers. The major difference between these two are:

What are two ways to launch a cryptanalytic attack against a cipher? Give example.

Ans) Here are two ways through cryptanalytic attack can be done against a cipher are:

Example: - In COA, the hacker able to decode the plaintext and even they attack the keys. The available information can be easily being read by the attacker through COA.

Example: - This attack totally depends on the timing. So here hacker looks for the appropriate timing when the system is vulnerable to attacks, at that time the attack happens. As this is a powerful way of attacking, the hacker can easily decode the cipher.

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

Ans) In the unconditionally secure cipher, the cipher text is generated by the encryption scheme and it does not have that much of information so that it can be determined uniquely the plaintext in it and it does not depend upon the quantity of ciphertext.

When it comes to Computationally secure cipher, this can be described as the cost carried out to decode that cipher should not exceeds the value of encrypted information. Moreover, the time required to decode the cipher exceeds the lifecycle of the encrypted information or data.

What algorithm would you recommend and why?

Ans) I would like to recommend the Advanced Encryption Standard as the cryptographic algorithm for our project. AES is being used by many organization as encryption algorithm and it is quite effective with 128-bit format. It defends against most of the attacks and the it is really very difficult to decode the encrypted data where the encryption done by AES.

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