Public Key Infrastructure (PKI) is a security protocol that is used to protect sensitive information exchanged over the internet. It is an encryption mechanism that secures data being transmitted on the internet by using a combination of public and private keys.
PKI works by using a system of digital certificates, which are issued by a trusted third-party called the Certificate Authority (CA). These certificates contain a public key that is used to encrypt messages sent between two parties, as well as a private key that is used to decrypt the message once it has been received. In other words, the public key is used to encrypt the message and the private key is used to decrypt it, ensuring that only the intended recipient can read the message.
Here’s an example of how PKI works in practice:
Suppose Alice wants to send a confidential document to Bob over the internet. In order to keep the document secure, Alice encrypts it using Bob’s public key, which is included in his digital certificate. The encrypted document is then sent over the internet to Bob. When Bob receives the encrypted document, he uses his private key to decrypt it and read the confidential information.
By using PKI, Alice and Bob can protect their confidential information from unauthorized access and ensure that only the intended recipient can read it. This is especially important for sensitive transactions such as online banking, e-commerce, and other forms of electronic commerce that require secure communication.
In summary, PKI is a security protocol that uses digital certificates and a combination of public and private keys to encrypt and decrypt sensitive information sent over the internet.