Cryptography final exam - Study guides, Class notes & Summaries

Which encryption standard uses the same key to encrypt and decrypt messages? - Symmetric - Asymmetric - Rivest-Shamir-Adleman (RSA) - Digital Signature Algorithm (DSA) - ANSWER - Symmetric *Which algorithm is designated as Type 2 product by the National Security Agency (NSA)? - Pegasus - Secure Hash Algorithm - Skipjack - Data Encryption Standard (DES) - ANSWER - Skipjack What is the most commonly used format for certificates? - SHA-2 - X.509 v1 - X.509 v3 - SHA-2 - ANSWE...

Distinguish between symmetric-key and asymmetric-key cryptosystems. - ANSWER - Aysmmetric key cryptography utilizes two separate keys, a public and a private key, as opposed to symmetric key cryptography, which only utilizes one key. While encryption and decryption in symmetric key cryptography is based on substitutions and permutations of symbols, encryption in asymmetric key cryptography is based off of applying mathematical functions to numbers. Distinguish between public and private keys...

Cryptography Final Exam Questions And Answers

CAB340 – Cryptography and Network Security Final Exam- Questions & Answers (100% Correct) CAB340 – Cryptography and Network Security Final Exam- Questions & Answers (100% Correct) Distinguish between symmetric-key and asymmetric-key cryptosystems. - ANSWER - Aysmmetric key cryptography utilizes two separate keys, a public and a private key, as opposed to symmetric key cryptography, which only utilizes one key. While encryption and decryption in symmetric key cryptography is based on sub...

Keys used in an encryption, and the corresponding decryption functions must be the same - ANSWER - False For a Shannon cipher(E,D) defined over (k,m,c), D(k, E(k,m))=m - ANSWER - True Knowing that entropy is a measure of randomness (more randomness =less predictability = more entropy), we can tell that ABCDEFGHHHHHHH has higher entropy than ABCDEFGH - ANSWER - False For enhanced security, an organization should use secret encryption algorithms that nobody knows - ANSWER - False Hash ...

Cryptography Final Exam (2023)- Complete Questions & Answers (Graded A+) Cryptography Final Exam (2023)- Complete Questions & Answers (Graded A+) Keys used in an encryption, and the corresponding decryption functions must be the same - ANSWER - False For a Shannon cipher(E,D) defined over (k,m,c), D(k, E(k,m))=m - ANSWER - True Knowing that entropy is a measure of randomness (more randomness =less predictability = more entropy), we can tell that ABCDEFGHHHHHHH has higher entropy than A...

The ______________ is the message after decryption - ANSWER - plaintext What type of cipher is the Vigenere cipher? - ANSWER - polyalphabetic What is the decryption of bsujqsyodysw by use of Vigenere cipher with the key "USF?" - ANSWER - happynewyear In Vernam cipher, its pad must be used just one time. - ANSWER - true What is the encryption of HAPPYNEWYEAR by use of Caesar cipher with its encryption key 10? - ANSWER - rkzzixogiokb Vigenere cipher overcomes the problem of a smal...

cryptology - ANSWER - science concerned with data communication and storage in secure and usually secret form. It encompasses both cryptography and cryptanalysis. cryptography - ANSWER - is the practice and study of techniques for secure communication in the presence of adversarial behavior cryptanalysis - ANSWER - The process of decrypting a message without knowing the cipher or key used to encrypt it. steganography - ANSWER - A field within cryptography; uses images to hide data. c...

Confidentiality - Only authorised people can read a message. A key is needed in order to read the message. Authentication - Only authorised people can write a message. A key is needed in order to write the message. Symmetric key cipher - KE = KD (or can easily be deduced from one another). Symmetric key cipher - Encryption and decryption keys known only to the sender and receiver. Symmetric key cipher - Requires a secure channel for transmission of the cryptographic key. Asymmetric key...

What security services does cryptography provide? What security services does cryptography not provide? - ANSWER - Provides: Confidentiality Integrity Authentication Non Repudiation Does Not Provide: 1. Access Control Data confidentiality: How to achieve data confidentiality? How to protect the confidentiality of bulk data (say 1 Giga bytes)? - ANSWER - Encryption What does Kerckhoffs' assumption/principle tell us? Why is it important? - ANSWER - "a cryptosystem should be s...