Block cipher - Study guides, Class notes & Summaries

WGU C839 Objective Assessment Study Guide (Latest 2024/ 2025 Update) Introduction to Cryptography| Qs & As| Grade A| 100% Correct (Verified Answers) Q: Information Theory Answer: -Published by Claude Shannon in 1949 in the Bell System Technical Journal - Important concepts: -Diffusion -Confusion -Avalanche Effect (Horst Feist's variation on Shannon's concept of diffusion Q: Kerckhoff's Principle Answer: -1883 -A crptosystem should be secure even if all its elemen...

What type of encryption uses different keys to encrypt and decrypt the message? A Symmetric B Private key C Secure D Asymmetric D The most widely used asymmetric encryption algorithm is what? A RSA B Vigenere C DES D Caesar Cipher A Original, unencrypted information is referred to as ____. A text B plaintext C cleantext D ciphertext B Which of the following is NOT an asymmetric system? A PGP B RSA C SSL D DES D In order for User A to send U...

GMU IT 366 Midterm Exam Study Guide Questions with Verified Solutions At each layer, the unit of data has a different name. What is the general name for this data unit? What are the data units used at ISO OSI layers 1 through 4? The general name for this data unit is a Protocol Data Unit (PDU). At ISO OSI Layers 1-4 (from top to bottom): L4 Application Layer: "segment" L3 Network Layer: "packet" L2 Data Link Layer: "frame" L1 Physical Layer: "bits/bit stream" Does the ter...

Which of the following are NOT operating modes of the DES encryption algorithm? A) CBC B) ECB C) CFB D) OFB E) CBE (Ans- e. DES has four modes of operations: CBC - Cipher Block Chaining. In CBC mode, each plaintext block is XORed with the previous cipher text block and then encrypted. ECB - Electronic Code Book. In ECB mode, each plaintext block is encrypted independently with the block cipher. CFB - Cipher Feedback. In CFB mode, the previous cipher text block is encrypted and the outpu...

WGU C839 Pre- Assessment V1 (Latest 2024/ 2025 Update) Introduction to Cryptography| Qs & As| Grade A| 100% Correct (Verified Answers) Q: Employee A created a secret key and wants to send it to Employee B without any coworkers being able to decrypt the message.Which key needs to encrypt the message? Answer: Employee B's public key Q: Which type of cipher is ChaCha? Answer: stream Q: What is the key size for RC4 with WEP? Answer: 40 bits Q: Which sym...

CRY 303c Final Exam | Questions with complete solutions Which of the following violate Kerckhoff's principle? Select all that are applicable. A. A company states that its system is "secure" because it uses confidential and proprietary protocols. B. The company password is written using an invisible ink, and only the people within the company know the fact that invisible ink is used. C. The algorithms for popular symmetric ciphers such as DES and AES are publicly known. D. The attacker has t...

Your project involves streaming web conference content from your web servers to multiple endpoints. Because of the sensitive nature of the content, encryption is mandated. What would be the preferred algorithm? A. 3DES B. AES C. RC4 D. MD5 - Answer: C. RC4 is a stream-based cipher, and the web conference traffic requires a stream cipher for performance reasons. A, B, and D are incorrect. 3DES and AES are symmetric block ciphers, but are poor choices for streaming media channels. MD5 is...

WGU C839V5/D334 ADDITIONAL PRACTICE QUESTIONS AND ANSWERS VERIFIED 100% The hash value in bits for MD5 is ____. A. 128 B. 160 C. 256 Ans- 128 Hashing involves taking a _____ length input and producing a _____ length output (message digest). A. fixed; fixed B. variable; fixed C. fixed; variable Ans- variable; fixed The hash value in bits for SHA-1 is ____. A. 128 B. 160 C. 256 Ans- 160 The hash value in bits for MD4 is ____. A. 128 B. 160 C. 256 Ans- 128 ...

CTNC Exam Questions & Answers 2024/2025 allows you to maintain confidentiality of data by converting plain text information into cipher text - ANSWERSEncryption Method of cryptography that involves substituting one character for another. - ANSWERSSubstitution Cipher Method of cryptography that involves substituting one character for another. - ANSWERSTransposition Cipher used to maintain the integrity of the information. goal is to prove that the information has not been altered - ...

MATH 5111 Final Exam Questions and Answers- Northeastern University Question 1 10 out of 10 points A strength of asymmetric algorithms when compared to symmetric algorithms is key management (sharing keys with others while maintaining secrecy). Selected Answer: True Answers: True False  Question 2 10 out of 10 points A strength of symmetric algorithms is that they have multiple modes. Selected Answer: True Answers: True False  Question 3 10 out of 10 points A weakness of sy...