Question 1 What is the goal of the digital certificate ? to identify an entity to numerically sign the public key of an entity to encrypt the private key of an entity to encrypt the public key of an entity
Question 2 How is called the concept that a certificate authority can in turn certify another one and so on, thus forming a sequence of certification ? chain of trust self-signature blockchain Web of Things
Question 3 Who is the root certificate authority of Wikipedia ? org *.wikipedia.org GlobalSign Organization Validation GlobalSign