Cybersecurity, Encryption and Digital Safety

In India, the term "Public Key Infrastructure" is used in the context of

Consider the following statements: A digital signature is 1. an electronic record that identifies the certifying authority issuing it 2. used to serve as a proof of identity of an individual to access information or server on Internet 3. an electronic method of signing an electronic document and ensuring that the original content is unchanged Which of the statements given above is/are correct?

The terms ‘WannaCry, Petya and EternalBlue’ sometimes mentioned in the news recently are related to

What is "Virtual Private Network"?