What is the primary purpose of using a hash function in digital signatures?

To create a unique representation of data

Which of the following best describes asymmetric encryption?

Involves a pair of keys: public and private

Is primarily used for data compression

Uses the same key for encryption and decryption

Is faster than symmetric encryption

What is the significance of the modulus in RSA encryption?

It is the product of two prime numbers

It defines the encryption algorithm

It is used for generating the public key

In the RSA algorithm, the private key is generated using

The extended Euclidean algorithm

The modular exponentiation operation

Why is padding used in RSA encryption?

To add randomness and defend against certain attacks

To reduce the size of the encrypted message

To speed up encryption and decryption processes

To enable encryption of large plaintext directly

What is the purpose of a digital signature in cryptography?

To verify the authenticity and integrity of a digital document

To encrypt data for secure transmission

To generate a pair of public and private keys

To pad plaintext for RSA encryption

What does the RSA algorithm rely on for its security?

The computational difficulty of factoring large prime numbers

The high speed of symmetric key algorithms

The randomness of padding schemes

The use of cryptographic hash functions

In hybrid encryption, the RSA algorithm is typically used for:

Exchanging a symmetric session key

Generating cryptographic hashes

What is the main challenge associated with symmetric key encryption that public key cryptography aims to solve?

Inability to encrypt large data

In the context of RSA, what does Euler’s totient function represent?

The number of positive integers up to a given integer that are relatively prime to it

The number of primes less than a given number

The sum of all positive integers up to a given number

The product of two large prime numbers

What is the primary purpose of the Extended Euclidean Algorithm in RSA?

To compute the greatest common divisor and find the private key

To generate large prime numbers

To perform modular exponentiation

Which of the following is a characteristic of "plain RSA" or "textbook RSA"?

It directly treats plaintext as a number and applies RSA

It is resistant to all known attacks

What is a major disadvantage of RSA compared to symmetric key algorithms like AES?

RSA cannot be used for digital signatures

RSA requires larger key sizes for the same level of security

Which RSA key component is typically made public?

The modulus (n) and the public exponent (e)

The modulus (n) and the private exponent (d)

What does the OAEP padding scheme help prevent in RSA encryption?

Deterministic encryption vulnerabilities

In the RSA algorithm, what condition must the public exponent (e) satisfy?

e must be relatively prime to Euler’s totient function of n

e must be larger than the modulus n

What is the main purpose of the PKCS#1 v1.5 padding scheme?

To make the plaintext less predictable and secure against certain attacks

To add random bytes to the plaintext

To ensure the plaintext is the same size as the modulus

Which of the following best describes a digital signature using RSA?

Encrypting the hash of the message with the private key

Encrypting the message with the public key

Encrypting the message with the private key

Encrypting the hash of the message with the public key

How does the Probabilistic Signature Scheme (PSS) enhance digital signatures?

By allowing multiple signatures for the same message

By removing the need for hashing

By using deterministic algorithms

What is the role of the public key in SSH key-based authentication?

To verify signatures made by the private key

To decrypt messages from the server

To generate the user's private key

In the context of HTTPS and TLS/SSL, public key cryptography is primarily used for:

Exchanging symmetric keys securely

Encrypting the actual data being transmitted

Verifying the integrity of the data

Which of the following is NOT a step in the RSA encryption process?

Encryption using the public key

Decryption using the private key

What happens if the same plaintext is encrypted multiple times using the same RSA public key without padding?

All ciphertexts will be identical

Each ciphertext will be different

The ciphertext will be shorter each time

The ciphertext cannot be decrypted

In the Diffie-Hellman key exchange, what are 'p' and 'g'?

'p' is a prime modulus and 'g' is a generator

'p' is a private key and 'g' is a public key

'p' is the plaintext and 'g' is the ciphertext

'p' and 'g' are both large prime numbers

What ensures that the private key in RSA remains secure and undisclosed?

It is protected and never shared outside the owner

It is stored alongside the public key

It is mathematically derived from the public key

It is encrypted with a symmetric key

What is the primary advantage of using hybrid encryption over pure public-key encryption?

Elimination of the need for padding

In the context of digital signatures, why is a cryptographic hash function used?

To ensure the message integrity by signing a fixed-size representation

How does the EMV standard enhance security in credit card transactions compared to magnetic stripes?

By enabling chip-based computations and secure data storage

By increasing the data storage capacity

By using symmetric key encryption

By eliminating the need for physical cards

W7 Public Key Cryptography

Authored by Elena Vu

Computers

University

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41 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the main challenge of symmetric key encryption?

Key generation problem

Key exchange problem

Key storage problem

Key length problem

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the Diffie-Hellman key exchange primarily address?

Data encryption

Digital signature creation

Public key generation

Secret key exchange

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which algorithm is known for using the concept of modular arithmetic in public key cryptography?

AES

Blowfish

RSA

DES

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the purpose of Euler's totient function in RSA?

To decrypt messages

To count integers relatively prime to n

To encrypt messages

To generate public keys

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the main advantage of hybrid encryption?

Reduced computational cost

Higher security level

Faster encryption speed

Lower key management complexity

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which padding scheme is considered more secure than PKCS#1 v1.5?

ISO/IEC 9796

None of the above

PKCS#1 v2.0

OAEP

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the primary function of a digital signature?

To compress data

To generate keys

To provide authenticity proof

To encrypt data

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W7 Public Key Cryptography

What is the main challenge of symmetric key encryption?

What does the Diffie-Hellman key exchange primarily address?

Which algorithm is known for using the concept of modular arithmetic in public key cryptography?

What is the purpose of Euler's totient function in RSA?

What is the main advantage of hybrid encryption?

Which padding scheme is considered more secure than PKCS#1 v1.5?

What is the primary function of a digital signature?

In the context of digital signatures, what does hashing the message achieve?

What is the role of the private key in public key cryptography?

Which of the following is a common application of public key cryptography?

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