W7 Public Key Cryptography

What is the main challenge of symmetric key encryption?

• Key generation problem

• Key exchange problem

• Key storage problem

• Key length problem

What does the Diffie-Hellman key exchange primarily address?

• Data encryption

• Digital signature creation

• Public key generation

• Secret key exchange

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

• AES

• Blowfish

• RSA

• DES

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

What is the main advantage of hybrid encryption?

• Reduced computational cost

• Higher security level

• Faster encryption speed

• Lower key management complexity

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

• ISO/IEC 9796

• None of the above

• PKCS#1 v2.0

• OAEP

What is the primary function of a digital signature?

• To compress data

• To generate keys

• To provide authenticity proof

• To encrypt data

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

• Ensures message integrity

• Reduces the computation time

• Increases the message size

• Encrypts the message

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

• To generate public keys

• To decrypt messages

• To encrypt messages

• To sign digital signatures

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

• Secure web browsing (HTTPS)

• Data backup

• File compression

• Image processing