Hash Functions and Cryptography Quiz

Which of the following is a property of a good hash function?

• It is reversible

• It produces variable length output

• It is deterministic and produces fixed-length output

• It produces the same output for different inputs

Which key is used to encrypt data in asymmetric encryption for confidentiality?

• Secret key

• Private key

• Public key

• Session key

What is the main purpose of digital signatures?

• Encrypt data

• Verify the authenticity of the sender

• Compress data

• Hide the message from the recipient

In a distributed system, what ensures that all nodes agree on a shared state?

• Hashing

• Consensus mechanism

• Load balancer

• Time synchronization

Which of the following is a disadvantage of centralized systems compared to distributed systems?

• Lower latency

• Easier maintenance

• Single point of failure

• Faster access control

What is the primary role of a node in a peer-to-peer network?

• Acts only as a client

• Acts as both client and server

• Routes traffic

• Encrypts all messages

Which data structure is most commonly used for verifying transaction integrity in blockchains?

• Binary tree

• B-tree

• Merkle tree

• AVL tree

In networking, what is the purpose of a port number?

• Encrypt data

• Specify the path

• Identify a specific process or service

• Deny access to unauthorized users

True or False: Public blockchains allow anyone to participate in the consensus process.

• True

• False

True or False: SHA-256 is a symmetric encryption algorithm used in blockchain.

• True

• False