Chapter 1 (1-5): Introduction to MLSA

Question 1

the science of encryption

Answer 1

Cryptography

Question 2

the science of breaking encryption

Answer 2

Cryptanalysis

Question 3

combination of cryptography and cryptanalysis.

Answer 3

Cryptology

Question 4

has been used in human communication for millennia as a way to preserve confidential information.

Answer 4

Cryptography

Question 5

[7] Some Example of Cryptography

Answer 5

• Egyptian Nonstandard Hieroglyphs
• Spartans Scytale
• Caesar Cipher
• Vigenere Table
• Zimmerman Telegram
• Code Talker
• Enigma Machine

Question 6

is a type of cryptography where every letter is replaced by a non-standard character.

Answer 6

Egyptian Nonstandard Hieroglyphs

Question 7

is one of the simplest and most widely known encryptions. Each letter in the plaintext is replaces by a letter some fixed number of positions down the alphabet.

Answer 7

Caesar Cipher

Question 8

a substitution type cypher that uses a table and a keywork in generating ciphertext.

Answer 8

Vigenere Table

Question 9

was a secret diplomatic communication issued from the Germany Foreign Office.

Answer 9

Zimmerman Telegram

Question 10

was a person employed by the military to use a little-known language as a mean o secret communication.

Answer 10

Code Talker

Question 11

is a cipher device developed and user by Nazi Germany during World War II.

Answer 11

Enigma Machine

Question 12

a mathematical algorithm that takes plain text and changes it into ciphertext for security purposes.

Answer 12

Modern Cryptography

Question 13

is any cryptographic algorithm that is based on a shared key that is used to encrypt and decrypt.

Answer 13

Symmetric Cryptosystem

Question 14

• The same method is used for encrypting and decrypting.

Answer 14

Symmetric Cryptosystem

Question 15

this method uses two different methods in cryptographic process.

Answer 15

Asymmetric Cryptosystem

Question 16

each plaintext digit is encrypted one at a time with corresponding digit of the keystream, to give a digit of the ciphertext stream.

Answer 16

Stream Cipher

Question 17

The encryption is done character by character in a form of a stream.

Answer 17

Stream Cipher

Question 18

is a deterministic algorithm operating on fixed-length groups of bits called blocks.

Answer 18

Block Cipher

Question 19

The plaintext is divided into several block. Encryption is done block by block.

Answer 19

Block Cipher

Question 20

is a method in cryptography by which cryptographic keys are exchanged between two parties, allowing use of cryptographic algorithm.

Answer 20

Key Exchange Protocol

Question 21

[2] Cryptography Goals

Answer 21

1. Encryption
2. Authentication

Question 22

prevent other from intercepting message.

Answer 22

Encryption

Question 23

prevent someone from impersonating the receiver of the message.

Answer 23

Authentication

Question 24

[4] Cryptographic Attacks

Answer 24

1. Ciphertext Only
2. Known Plaintext
3. Chosen Plaintext
4. Distinguishing Attack

Question 25

attacker has only ciphertext.

Answer 25

Ciphertext Only

Question 26

attacker has plaintext and corresponding ciphertext.

Answer 26

Known Plaintext

Question 27

attacker can encrypt messages of his choosing.

Answer 27

Chosen Plaintext

Question 28

an attacker can distinguish your cipher from an ideal cipher.

Answer 28

Distinguishing Attack

Question 29

the security of an encryption system must depend only on the key, not on the secrecy of the algorithm.

Answer 29

Kerckhoffs’ Principle

Question 30

is the computational task of finding representative of a residue class. It goes with the principle, easy to compute but hard to reverse.

Answer 30

Discrete Logarithm Problem

Question 31

is an asymmetric key encryption algorithm got public-key cryptography which is based on Diffie-Hellman Key Exchange Protocol.

Answer 31

El Gamal Cryptosystem

Question 32

described the El Gamal Cryptosystem.

Answer 32

Taher Elgamal (1985)

Question 33

is a variant of El Gamal signature scheme, which should not be confused WITH Elg Gamal Encryption.

Answer 33

Digital Signature Algorithm (DSA)

Question 34

was first published in Scientific American, August 1977. It is currently the “work horse” of internet security.

Answer 34

RSA Cryptosystem