Block cipher - Study guides, Class notes & Summaries

Certified Encryption Specialist Latest Update October 2024 Cryptography - Answer--The science of altering communication so that it cannot be understood without having a key. Caesar Cipher - Answer--Simple cipher that uses shifting letters. Atbash - Answer--Used by Hebrews, cipher that reverses the alphabet. ROT13 - Answer--Cipher that rotate or shifts by 13 letters. Scytale - Answer--Cylinder tool used to encrypt and decrypt plaintext using a cloth or piece of leather wrapped around a rod. ...

Crypto Final Actual Exam Questions and CORRECT Answers Cipher and symmetric key encryption: Can we prove security of block ciphers already? - CORRECT ANSWER- no Cipher and symmetric key encryption: Define shift cipher - CORRECT ANSWER- A shift cipher can be defined like that: Enc(m) = m + k mod 26, and Dec(c) = c - k mod 26, here k is the secret key

802.1x Correct Answer An IEEE standard used to provide a port-based authentication mechanism over a LAN or wireless LAN. After Action Report Correct Answer A post-incident report that include lessons learned to improve security for the future. Accountability Correct Answer In security terms, the process of determining who to hold responsible for a particular activity or event. ACL Correct Answer A list that specifies which objects in a system have which permissions. Active Directory ...

WGU Course C839 - Intro to Cryptography Questions Correctly Answered 2023 GRADED A What type of encryption uses different keys to encrypt and decrypt the message? A Symmetric B Private key C Secure D Asymmetric - Answer D The most widely used asymmetric encryption algorithm is what? A RSA B Vigenere C DES D Caesar Cipher - Answer A Original, unencrypted information is referred to as ____. A text B plaintext C cleantext D ciphertext - Answer B Which of the following is NOT...

1.1).What is the OSI security architecture? - Answer-framework that provides a systematic way of defining the requirements for security and characterizing the approaches to satisfying those requirements. The document defines security attacks, mechanisms, and services, and the relationships among these categories. 1.2).What is the difference between passive and active security threats? - Answer-Passive attacks have to do with eavesdropping on, or monitoring, transmissions. Electronic mail, f...

Cryptography provides 5 basic protections, what are they? Confidentiality Integrity Availability Authentication Non-repudiation What are some Symmetric key disadvantages. Key management depends on all users to keep key secret Not easily scalable to large groups Symmetric key advantages. (List 2) Symmetric key algorithms are very fast High security especially with large key sizes Name 2 encryption methods. Block Cipher Stream Cipher _____ cipher encry...

Electronic Code Book (ECB) Correct Answer-A mode of operation for a block cipher, with the characteristic that each possible block of plaintext has a defined corresponding ciphertext value, and vice versa ECB Correct Answer-Which block cipher mode is MOST susceptible to plaintext attacks? Salting Correct Answer-Random data that is used as an additional input to a one-way function that "hashes" data, a password or passphrase. Used to safeguard passwords in storage. Hash Correct Answe...

1. How did the ATBASH cipher work? correct answer By substituting each letter for the letter from the opposite end of the alphabet (i.e. Abecomes Z, B becomes Y, etc.) 2. DES has a key space of what? correct answer 2^56 3. Which of the following are valid key sizes for AES (choose three)? correct answer c. 128 d. 192 e. 256 4. Which of the following algorithms uses three different keys to encrypt the plain text? correct answer 3DES Triple Data Encryption System 5. Which of the f...

WGU C839 - Intro to Cryptography Exam 2022 completely Solved 100 Q&A GRADED A+ The most widely used asymmetric encryption algorithm is what? A RSA B Vigenere C DES D Caesar Cipher - Answer A Original, unencrypted information is referred to as ____. A text B plaintext C cleantext D ciphertext - Answer B Which of the following is NOT an asymmetric system? A PGP B RSA C SSL D DES - Answer D In order for User A to send User B an encrypted message that only User B can read, User A m...

Which Security policy rule will allow an admin to block facebook chat but allow Facebook in general? A. Deny application facebook-chat before allowing application facebook B. Deny application facebook on top C. Allow application facebook on top D. Allow application facebook before denying application facebook-chat - ️️A. Deny application facebook-chat before allowing application facebook Which two benefits come from assigning a Decryption Profile to a Decryption policy rule wi...