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Questions and Answers
What is the field of Cryptology concerned with?
What is the field of Cryptology concerned with?
- The areas of cryptography and cryptanalysis together (correct)
- The schemes used for decryption
- The study of encryption
- The process of converting from plaintext to ciphertext
What type of attack is a public-key encryption scheme vulnerable to?
What type of attack is a public-key encryption scheme vulnerable to?
- A key distribution attack
- An insider attack
- A social engineering attack
- A brute-force attack (correct)
What is the key size requirement for practical encryption and decryption in the public-key method?
What is the key size requirement for practical encryption and decryption in the public-key method?
- Too large
- Too small
- Average
- Large enough (correct)
What does the cryptanalyst need to know in the cyphertext-only attack type?
What does the cryptanalyst need to know in the cyphertext-only attack type?
On average, how many of the possible keys must be tried in a brute-force attack to achieve results?
On average, how many of the possible keys must be tried in a brute-force attack to achieve results?
What type of attack attempts to deduce a specific plaintext or to deduce the key being used?
What type of attack attempts to deduce a specific plaintext or to deduce the key being used?
What is an example of a symmetric cipher system?
What is an example of a symmetric cipher system?
What is required in symmetric key cryptography?
What is required in symmetric key cryptography?
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Study Notes
Cryptology
- Cryptology is the study of encryption and cryptanalysis together.
- It involves the process of converting from plaintext to ciphertext.
Public-Key Encryption Scheme
- A public-key encryption scheme is vulnerable to a brute-force attack.
Key Size for Public-Key Method
- For practical encryption and decryption in the public-key method, the key size should be large enough.
Types of Attacks
- In the ciphertext-only attack, the cryptanalyst must know the encryption algorithm.
- In brute-force attacks, on average, half of the possible keys must be tried to achieve results.
- Cryptanalysis attacks exploit the characteristics of the algorithm to attempt to deduce a specific plaintext or to deduce the key being used.
Symmetric Cipher System
- Diffie-Hellman and DSS are not examples of symmetric cipher systems.
- DES is an example of a symmetric cipher system.
Symmetric Key Cryptography
- In symmetric key cryptography, both parties must possess a secret key.
Asymmetric Cipher System
- In an asymmetric cipher system, it is computationally infeasible for an adversary, knowing the public key, to determine the private key.
Secure Use of Private Key Encryption
- One requirement for the secure use of private key encryption is that the encryption algorithm should be strong.
- The pair of keys should be computationally hard to discover.
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