Select the false statement from the list below. To encrypt data using public key cryptography, one key is generated, while another is utilised to decode it. It's the same thing whether it's in plain text or not. O None We cannot just replace encryption with cypher.text.

What is the difference between a block cipher and a stream cipher? What is the difference between an unconditionally secure cipher and a computationally secure cipher?   What is the difference between a monoalphabetic cipher and a polyalphabetic cipher?  Why is it important to study Feistel ciphers?

Describe the terms “plaintext,” “ciphertext,” and “secret key” as they apply to symmetric encryption Cryptographic systems are characterized along three independent dimensions. What are these three dimensions? The term “strong encryption” refers to encryption schemes that make it impractical for unauthorized persons to gain access to plaintext that has been encrypted. What properties are characteristic of a strong encryption algorithm?

Don't need code.

Encrypt the message "do not attack" using the affine cipher with key = (17,14).  Ignore the space between the words. Decrypt the message to get the original plaintext

Let's pretend a Vigen'ere cipher was used to encrypt a long string of text, and that the encrypted text included many instances of the same string. Describe the methods you'll use to calculate the length of the key based on this information.

Public key cryptography faced the challenge of distributing keys in the beginning. To easily show how key distribution may be carried out, why not use an example?

One of the most basic problems that public key cryptography set out to solve was the problem of key distribution.Could you give us an overview in a nutshell?

Perform the Encryption and then the Decryption for the Hill Cipher where the Plain text: "POH" and the key is: "GYBNQKURP".

Let k be the encipherment key for a Caesar cipher. The decipherment key is 26 – k.One of the characteristics of a public key cryptosystem is that the encipherment anddecipherment keys are different. Explain why the Caesar cipher is a secret keycryptosystem, not a public key cryptosystem?