Cryptology

Cryptology

By ammar al-qadasi

Multiple Choice

What is the term used to describe the science of making and breaking secret codes?

• cryptology

• Cryptoanalysis

• Cryptography

• All answers

Multiple Choice

_______ is the science and art of transforming messages to make them secure and immune to attacks.

• Cryptography

• Cryptoanalysis

• neither Cryptography nor Cryptoanalysis

• either Cryptography or Cryptoanalysis

Multiple Choice

The art and science of breaking the cipher text is known as

• Cryptanalysis

• Cryptography

• Staganography

• Watermarking

Multiple Choice

In cryptography, what is cipher?

• algorithm for performing encryption and decryption

• encrypted message

• both algorithm for performing encryption and decryption and encrypted message

• decrypted message

Multiple Choice

In cryptography, the order of the letters in a message is rearranged by __________

• transpositional ciphers

• substitution ciphers

• both transpositional ciphers and substitution ciphers

• quadratic ciphers

Multiple Choice

What is data encryption standard (DES)?

• block cipher

• stream cipher

• bit cipher
  

• byte cipher

Multiple Choice

Cryptanalysis is used __________

• to find some insecurity in a cryptographic scheme

• to increase the speed

• to encrypt the data

• to make new ciphers

Multiple Choice

The two methods of encrypting data are?

• Substitution and transposition

• Block and stream

• Symmetric and asymmetric

• DES and AES

Multiple Choice

Cryptography supports all of the core principles of information security except

• Availability

• Confidentiality

• Integrity

• Authenticity

Multiple Choice

In which type of encryption is the same key used to encrypt and decrypt data?

• public

• asymmetric

• symmetric

• private

Multiple Choice

What is the purpose of the ShiftRows step in AES?

• Substitution

• Permutation to provide diffusion

• XOR operation with the key

• Key expansion

Multiple Choice

Which AES operation is responsible for confusion?

• AddRoundKey

• MixColumns

• SubBytes

• ShiftRows

Multiple Choice

In AES, the AddRoundKey step involves which operation?

• XOR with the round key

• Bitwise AND with the key

• Multiplication in Galois field

• Circular shifting

Multiple Choice

Which of the following is a limitation of DES?

• High computational complexity

• Small block size

• Lack of Feistel structure

• No key expansion

Multiple Choice

Which algorithm was developed as a successor to DES?

• RSA

• Blowfish

• AES

• SHA-256