Cryptography

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EdDSA

What is the difference between EdDSA and DSA/ECDSA?

EdDSA uses elliptic curves, while DSA/ECDSA use RSA

EdDSA uses a deterministic nonce, while DSA/ECDSA use a random nonce

EdDSA is faster than DSA/ECDSA

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EdDSA

What is the security level of Ed25519?

64-bit

128-bit

256-bit

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EdDSA

What is EdDSA?

A hash function

A symmetric cipher

A digital signature scheme

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Group theory

What is the connection between group theory and public key cryptography?

Group theory is not related to public key cryptography

Group theory is only used in classical cryptography

Group theory provides the mathematical framework for understanding certain groups that are used in public key cryptography

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Diffie–Hellman key exchange

What is the name of the algorithm that is a public domain algorithm?

Diffie-Hellman-Merkle key exchange

RSA

Elliptic curve Diffie-Hellman protocol

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Diffie–Hellman key exchange

What is the basis for a variety of authenticated protocols?

Diffie-Hellman key exchange is only used for non-authenticated protocols

Diffie-Hellman key exchange is not used for authenticated protocols

Diffie-Hellman key agreement provides the basis for a variety of authenticated protocols

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Diffie–Hellman key exchange

What is the Diffie-Hellman key exchange method used for?

Securely exchanging passwords

Securely exchanging cryptographic keys

Securely exchanging credit card information

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Cryptography

What is the main advantage of asymmetric cryptosystems?

Asymmetric systems are faster than symmetric systems.

Asymmetric systems use a shorter key than symmetric systems.

Asymmetric systems are more secure than symmetric systems.

Asymmetric systems use the same key to encrypt and decrypt a message.

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Cryptography

What is the difference between a cipher and a code?

A code is a scheme for changing or substituting an element below a letter, while a cipher replaces a unit of plaintext with a code word.

A code is a scheme for changing or substituting an element below a letter, while a cipher changes or substitutes an element below that level to produce a ciphertext.

A code replaces a unit of plaintext with a ciphertext, while a cipher replaces a unit of plaintext with a code word.

A code replaces a unit of plaintext with a code word, while a cipher replaces a unit of plaintext with a ciphertext.

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Cryptography

What is the difference between symmetric and asymmetric cryptosystems?

Symmetric systems use a public key to encrypt a message and a related private key to decrypt it.

Asymmetric systems use the same secret key to encrypt and decrypt a message.

Symmetric and asymmetric systems use the same encryption and decryption algorithms.

Symmetric systems are more secure than asymmetric systems.

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