Without public key cryptography, it would not be secure to send certain types of data and information over the internet. The internet is an unsecure online environment, which is open to all users. Since the internet is not secure, it is not a good idea to send any type of information to someone else, without using some sort of security. There are different security options available, and one of the more popular choices is using digital certificates.
Public Key Cryptography Uses Digital Certificates Containing a Public Key
Digital certificates are an essential part to public key cryptography. Organizations, like your bank will issue digital certificates, containing a public key, to their users. When you access your bank’s website, your public key is used to confirm your identity, after you enter your user name and password. Without your bank issued public key, your bank will deny you online access to your bank account information.