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Questions and Answers
What is the block size for all AES ciphers?
What is the block size for all AES ciphers?
- 256 bits
- 128 bits (correct)
- 192 bits
- 64 bits
How many rounds are there for 192-bit keys in AES encryption?
How many rounds are there for 192-bit keys in AES encryption?
- 12 rounds (correct)
- 14 rounds
- 9 rounds
- 10 rounds
What type of cipher is AES?
What type of cipher is AES?
- Substitution Cipher
- Block Cipher (correct)
- Stream Cipher
- RSA Cipher
Which encryption standard was replaced by AES?
Which encryption standard was replaced by AES?
What transformation does the ShiftRows step involve in AES encryption?
What transformation does the ShiftRows step involve in AES encryption?
What is another name for symmetric key encryption?
What is another name for symmetric key encryption?
Which encryption method requires both the sender and receiver to use the same key for encryption and decryption?
Which encryption method requires both the sender and receiver to use the same key for encryption and decryption?
What is the main limitation or problem with symmetric encryption?
What is the main limitation or problem with symmetric encryption?
What is used to preserve the security of the key in symmetric cryptosystems?
What is used to preserve the security of the key in symmetric cryptosystems?
Which encryption methods are still in use in combination with public key cryptosystems due to some advantages?
Which encryption methods are still in use in combination with public key cryptosystems due to some advantages?
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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.
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