What is PKI? The PKI fundamentals

PKI stands for Public Key Infrastructure. The underpinning concept of PKI, where one person encrypts a message knowing that the recipient has the secret key to decrypt it, has been in practice for thousands of years. Today, it’s most familiar use is probably online communications. To ensure data safety when communicating with others, the data is encrypted and can only be decrypted by a party with the correct private key.