10 Questions
What is the block size for all AES ciphers?
128 bits
How many rounds are there for 192-bit keys in AES encryption?
12 rounds
What type of cipher is AES?
Block Cipher
Which encryption standard was replaced by AES?
DES
What transformation does the ShiftRows step involve in AES encryption?
Rotating the rows to the left
What is another name for symmetric key encryption?
Shared key cryptography
Which encryption method requires both the sender and receiver to use the same key for encryption and decryption?
Symmetric key encryption
What is the main limitation or problem with symmetric encryption?
Key management system
What is used to preserve the security of the key in symmetric cryptosystems?
In-person transfer
Which encryption methods are still in use in combination with public key cryptosystems due to some advantages?
DES and AES
Study Notes
AES Encryption
- The block size for all AES ciphers is 128 bits.
AES Encryption Rounds
- There are 12 rounds for 192-bit keys in AES encryption.
AES Cipher Type
- AES is a type of symmetric key block cipher.
Replacement of Encryption Standard
- AES replaced the Data Encryption Standard (DES) as the encryption standard.
ShiftRows Transformation
- The ShiftRows step in AES encryption involves a circular byte shift transformation.
Symmetric Key Encryption
- Another name for symmetric key encryption is private key encryption.
Symmetric Encryption Method
- Symmetric encryption requires both the sender and receiver to use the same key for encryption and decryption.
Limitation of Symmetric Encryption
- The main limitation or problem with symmetric encryption is the difficulty of securely exchanging and managing the secret key.
Preserving Key Security
- Secure key exchange and distribution protocols are used to preserve the security of the key in symmetric cryptosystems.
Combination with Public Key Cryptosystems
- Symmetric encryption methods are still in use in combination with public key cryptosystems due to their advantage of fast encryption and decryption speeds.
Test your knowledge on the fundamentals of public cryptography, including shared key cryptography, public-key encryption, RSA, DH, CAs, PKI, hash functions, and network security. Explore the basics of TCP/IP stack and symmetric key cryptosystems.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
