Podcast
Questions and Answers
What is the main reason why Double-DES is not used?
What is the main reason why Double-DES is not used?
- It is more computationally expensive than Triple-DES
- It is vulnerable to a meet-in-the-middle attack (correct)
- It requires more key material than Triple-DES
- It is less secure than Triple-DES
What is the main advantage of using Triple-DES with two keys instead of three keys?
What is the main advantage of using Triple-DES with two keys instead of three keys?
- It requires less key material (correct)
- It is more secure against brute-force attacks
- It is more computationally efficient
- It provides better confusion and diffusion properties
What is the main purpose of using an E-D-E sequence in Triple-DES with two keys?
What is the main purpose of using an E-D-E sequence in Triple-DES with two keys?
- To make the algorithm more resistant to linear and differential cryptanalysis
- To increase the effective key size
- To ensure that encryption and decryption are equivalent in security (correct)
- To provide better confusion and diffusion properties
What is the main difference between Triple-DES with two keys and Triple-DES with three keys?
What is the main difference between Triple-DES with two keys and Triple-DES with three keys?
Which cryptographic property is most important in preventing the meet-in-the-middle attack on Double-DES?
Which cryptographic property is most important in preventing the meet-in-the-middle attack on Double-DES?
In which mode does the message get treated as a stream of bits and the output of the cipher is added to the message?
In which mode does the message get treated as a stream of bits and the output of the cipher is added to the message?
What is the main limitation mentioned for Cipher Feedback Mode (CFB)?
What is the main limitation mentioned for Cipher Feedback Mode (CFB)?
Which mode uses counter value encryption instead of feedback value encryption?
Which mode uses counter value encryption instead of feedback value encryption?
Why is Triple-DES considered a replacement for DES?
Why is Triple-DES considered a replacement for DES?
What is an advantage of Counter Mode (CTR) over other modes mentioned?
What is an advantage of Counter Mode (CTR) over other modes mentioned?
Which mode requires the sender and receiver to remain in sync and use a recovery method to ensure synchronization?
Which mode requires the sender and receiver to remain in sync and use a recovery method to ensure synchronization?
What concept did Claude Shannon introduce in 1949 that forms the basis of modern block ciphers?
What concept did Claude Shannon introduce in 1949 that forms the basis of modern block ciphers?
Which cryptographic operation helps provide confusion and diffusion of the message in encryption?
Which cryptographic operation helps provide confusion and diffusion of the message in encryption?
What is the main advantage of increasing the key size in a Feistel cipher?
What is the main advantage of increasing the key size in a Feistel cipher?
How does a Feistel cipher structure partition the input block during encryption?
How does a Feistel cipher structure partition the input block during encryption?
What operation is performed on the left data half based on the round function of the right half & subkey in a Feistel cipher?
What operation is performed on the left data half based on the round function of the right half & subkey in a Feistel cipher?
What property should an encryption algorithm exhibit for preventing guessing keys effectively?
What property should an encryption algorithm exhibit for preventing guessing keys effectively?
How do S-Boxes contribute to the encryption process?
How do S-Boxes contribute to the encryption process?
Claude Shannon suggested combining elements to obtain diffusion in encryption. What does diffusion do?
Claude Shannon suggested combining elements to obtain diffusion in encryption. What does diffusion do?
What was the significant controversy surrounding the Data Encryption Standard (DES) design despite it being widely used in financial applications?
What was the significant controversy surrounding the Data Encryption Standard (DES) design despite it being widely used in financial applications?
What key design principle would help make cipher analysis harder but might also slow down encryption?
What key design principle would help make cipher analysis harder but might also slow down encryption?
