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- The main characteristic of the Public Key Infrastructure (ICP) – or Public Key Infrastructure (PKI) – is that it uses a pair of keys, public and private, to provide the underlying security services. Regarding aspects related to the security of a cryptographic system, analyze the following statements. I. Typically, what compromises the security of a cryptographic model has less to do with the design of that model and more to do with poor key management. II. Private keys must remain secret from all parties involved, throughout their lifecycle, including the owners of those keys, which is why they are also called secret keys. III. Because public keys are in the open domain they can be tampered with, there is no guarantee that a public key is correct. The infrastructure by which they are managed must be trusted. IV. A public key infrastructure (or Public Key Infrastructure - PKI) guarantees some aspects related to the life cycle of a public key, such as generation, installation and…Question 2: One type of the modern encryption systems is the block encryption. Using your own words, answer the following questions:a. Mention the two basic approaches for block encryption. b. Describe the features and drawbacks (at least two) for each of the two basic approaches forblock encryption. c. Provide proper diagrams that illustrate the functionalities for the above two approaches.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?
- Asymmetric and symmetric encryption schemes have equal benefits and drawbacks. How does one decide what kind of encryption to use and what factors need to be taken into account?Asymmetric and symmetric encryption algorithms each have their own set of benefits and drawbacks. What considerations must be made when deciding on the type of encryption to be used?The number of encryption operations required to transmit a big file is comparable for block chaining and feedback techniques.How much more effective is one alternative compared to the other?
- Part 1: Please answer the following questions about the fundamental of cryptography. Each question has only one correct answer. 1, Which description about block ciphers is NOT correct? Block ciphers encrypt the message block by block. A block cipher with a small block is vulnerable to the codebook attack. The encryption and decryption algorithms in block ciphers use the same secret key. The key length for block cipher should be very short to defend against the exhaustive key search attacks. 2, If the key length of a block cipher is 64 bits, what is the size of the key space? Hint: The key space consists of all possible keys. 64 264 232 2128 3, Modern block ciphers combine substitution S and permutation P operations to improve security. Based on the security rule, the cipher should not use consecutive substitutions or consecutive permutations. In the following combinations, which one violates the above security rule? ?1?1?2?2 B. ?1?1?2?2 C. ?1?1?2?2 4, Which…There are different modes of operation of a block cipher in different properties being achieved which add to the security of the underlying block cipher. One of them is Cipher Block Chaining (CBC).i. Explain ONE (1) purpose of implementing CBC operation for a block cipher.ii. Draw a suitable diagram to illustrate and briefly explain how Cipher BlockChaining (CBC) works in encryption and decryption.Asymmetric and symmetric encryption techniques each have advantages and disadvantages. What factors must be considered before deciding on the type of encryption to be used?
- Comparing cypher block chaining to cypher feedback mode in terms of the number of encryption operations necessary to transport a large file, cypher block chaining is more efficient than cypher feedback mode.Calculate the key space for 128-bit keys and compare that to the key space for 10-character passwords (lower case English alphabetic, upper case English alphabetic, 10 digits and 14 special characters are allowed). How many characters does a password following the above rules must have to achieve the same or better security as 128-bit random keys if the passwords would be chosen randomly?Describe the process used to implement end-to-end encryption.