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Question 6/74
With Cipher feedback (CFB) what happens?
Correct Answer: B
The ciphertext block is encrypted then the ciphertext produced is XOR'd back with the plaintext to produce the current ciphertext block
https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Cipher_feedback_(CFB) The cipher feedback (CFB) mode, a close relative of CBC, makes a block cipher into a self-synchronizing stream cipher.
https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Cipher_feedback_(CFB) The cipher feedback (CFB) mode, a close relative of CBC, makes a block cipher into a self-synchronizing stream cipher.
- Question List (74q)
- Question 1: Basic information theory is the basis for modern symmetric c...
- Question 2: Which of the following algorithms uses three different keys ...
- Question 3: Which of the following is generally true about key sizes?...
- Question 4: Which of the following statements is most true regarding bin...
- Question 5: Which one of the following uses three different keys, all of...
- Question 6: With Cipher feedback (CFB) what happens?...
- Question 7: Original, unencrypted information is referred to as ____....
- Question 8: Which of the following asymmetric algorithms is described by...
- Question 9: A _____ is a function is not reversible....
- Question 10: Calculates the average LSB and builds a table of frequencies...
- Question 11: Asymmetric encryption method developed in 1984. It is used i...
- Question 12: Which of the following Secure Hashing Algorithm (SHA) produc...
- Question 13: Bob's password is hashed, and so is John's. Even though they...
- Question 14: Storing private keys with a third party is referred to as wh...
- Question 15: If the round function is a cryptographically secure pseudora...
- Question 16: John is trying to explain the basics of cryptography to a gr...
- Question 17: This is a 128 bit hash that is specified by RFC 1321. It was...
- Question 18: Which of the following is the successor of SSL?...
- Question 19: With Electronic codebook (ECB) what happens:...
- Question 20: What advantage do symmetric algorithms have over asymmetric ...
- Question 21: Cylinder tool. Wrap leather around to decode. The diameter i...
- Question 22: A number that is used only one time, then discarded is calle...
- Question 23: Which of the following uses an 80 bit key on 64 bit blocks?...
- Question 24: What is a TGS?
- Question 25: In a Feistel cipher, the two halves of the block are swapped...
- Question 26: Which of the following equations is related to EC?...
- Question 27: The art and science of writing hidden messages so that no on...
- Question 28: What is the largest key size that AES can use?...
- Question 29: What best describes the shifting of each letter a fixed numb...
- Question 30: This algorithm was published by the German engineering firm ...
- Question 31: During the process of encryption and decryption, what keys a...
- Question 32: The mode makes a block cipher into a synchronous stream ciph...
- Question 33: What is the name of the attack where the attacker obtains th...
- Question 34: If you XOR 10111000 with 10101010, what is the result?...
- Question 35: Denis is looking at an older system that uses DES encryption...
- Question 36: What is a "Collision attack" in cryptography?...
- Question 37: Which of the following is a key exchange protocol?...
- Question 38: Protocol suite provides a method of setting up a secure chan...
- Question 39: Which of the following is a substitution cipher used by anci...
- Question 40: The next number is derived from adding together the prior tw...
- Question 41: RFC 1321 describes what hash?
- Question 42: In steganography, ________ is the data to be covertly commun...
- Question 43: Which of the following was a multi alphabet cipher widely us...
- Question 44: In a ______ the attacker discovers a functionally equivalent...
- Question 45: Which of the following is not a key size used by AES?...
- Question 46: The reverse process from encoding - converting the encoded m...
- Question 47: Which one of the following is an example of a symmetric key ...
- Question 48: How did the ATBASH cipher work?...
- Question 49: What is the formula m^e %n related to?...
- Question 50: Juanita is attempting to hide some text into a jpeg file. Hi...
- Question 51: How can rainbow tables be defeated?...
- Question 52: Which of the following is assured by the use of a hash?...
- Question 53: Which one of the following terms describes two numbers that ...
- Question 54: What is a variation of DES that uses a technique called Key ...
- Question 55: You have been tasked with selecting a digital certificate st...
- Question 56: In IPSec, if the VPN is a gateway-gateway or a host-gateway,...
- Question 57: In 1977 researchers and MIT described what asymmetric algori...
- Question 58: An authentication method that periodically re-authenticates ...
- Question 59: Jane is looking for an algorithm to ensure message integrity...
- Question 60: Created in 1977 by Ron Rivest, Adi Shamir, and Leonard Adlem...
- Question 61: Manipulating individuals so that they will divulge confident...
- Question 62: What size block does AES work on?...
- Question 63: A cryptanalysis success where the attacker deduces the secre...
- Question 64: Which of the following is a block cipher?...
- Question 65: Cryptographic hashes are often used for message integrity an...
- Question 66: A real time protocol for verifying certificates (and a newer...
- Question 67: WPA2 uses AES for wireless data encryption at which of the f...
- Question 68: Encryption of the same plain text with the same key results ...
- Question 69: Frank is trying to break into an encrypted file... He is att...
- Question 70: A 160-bit hash algorithm developed by Hans Dobbertin, Antoon...
- Question 71: Ahlen is using a set of pre-calculated hashes to attempt to ...
- Question 72: Which one of the following attempts to hide data in plain vi...
- Question 73: Network of trusted certificate authority servers. Use asymme...
- Question 74: In relationship to hashing, the term _____refers to random b...
