Computer Security - Cryptographic Tools Week3_Evaluation_T1

What is the universal technique for providing confidentiality for transmitted data?

• Hash functions

• Symmetric encryption

• Public-key encryption

• Digital signatures

What are the two requirements for secure use of symmetric encryption?

• Strong encryption algorithm and public key

• Secure key and public key

• Secure key and digital signatures

• Strong encryption algorithm and secure key

What is the key length used in Data Encryption Standard (DES)?

• 256 bits

• 64 bits

• 56 bits

• 128 bits

What is the drawback of using a 56-bit key in DES?

• Low encryption speed

• Vulnerability to brute-force attack

• Incompatibility with modern systems

• Limited data block size

What is the key length used in Triple DES (3DES)?

• 56 bits

• 64 bits

• 168 bits

• 128 bits

Which encryption algorithm was selected as the Advanced Encryption Standard (AES) in 2001?

• RC4

• Rijndael

• 3DES

• DES

What is the main implementation of Stream Cipher?

• Rijndael

• Vernam Cipher

• Feistel Cipher

• RC4

What are the two properties of the operation of a secure cipher identified by Claude Shannon?

• Confusion and substitution

• Diffusion and transposition

• Confusion and diffusion

• Substitution and transposition

What is the purpose of a Message Authentication Code (MAC)?

• To decrypt the message

• To encrypt the message

• To authenticate the message

• To compress the message

What attack approach exploits logical weakness in an algorithm?

• Cryptanalysis

• Substitution attack

• Frequency analysis

• Brute-force attack