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Public Key Cryptography Basics

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Questions and Answers

What is the primary purpose of the public key in a secure communication system?

To encrypt confidential messages (correct)
To authenticate the identity of the sender
To make the private key publicly accessible
To decrypt confidential messages

What happens to the private key when a system changes its private key?

It is shared with other users to ensure compatibility
It is published to ensure the old public key is no longer used
It is deleted and replaced with the new public key
It is kept secret and the new public key is published (correct)

What is the main advantage of using public and private keys in a secure communication system?

It provides a way to authenticate the sender's identity
It ensures that only the intended recipient can decrypt the message (correct)
It allows for faster data transmission
It eliminates the need for encryption and decryption

What is the role of the public register or accessible file in the system?

To store the public keys of all users (A) Signup and view all the answers

What is the consequence of a user's private key being compromised?

Incoming communication is no longer secure (B) Signup and view all the answers

What is the purpose of Alice maintaining a collection of public keys obtained from others?

To facilitate communication with other users (C) Signup and view all the answers

What is a necessary condition for a public-key encryption scheme to be secure?

It is computationally infeasible for an adversary to determine the private key (A) Signup and view all the answers

What is a trap-door one-way function?

A family of invertible functions that are easy to compute but hard to invert (C) Signup and view all the answers

Why are key sizes limited in public-key cryptography?

To ensure fast encryption and decryption (D) Signup and view all the answers

What is a probable-message attack?

An attack that involves appending random bits to messages (B) Signup and view all the answers

What is the primary use of public-key cryptography today?

Key management and signature applications (B) Signup and view all the answers

What is the purpose of a one-way function in public-key cryptography?

To ensure the security of the system (A) Signup and view all the answers

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