Top 5 Common Use Cases For PKI

As companies become more reliant on digital information and electronic transactions, they must comply with increasingly strict data privacy and security rules.

Business applications and networks are now reliant on using digital credentials to manage how individuals and entities access confidential data and vital system resources, but that introduces another dynamic.

As corporations become digitally inclined, there is an increase in vulnerability to cyber-attacks and dangerous actors, leading to the rise of various authentication systems. PKI is the preferred method of enforcing the authenticity of identity credentials among all the authentication systems.

What is PKI?

PKI is now used by businesses to improve security via encryption. Today, the most popular form of encryption uses a public key, which anyone can use to encrypt a message, and a private key (also known as a secret key), which is usually only possible for one person to decrypt. Individuals, devices, and applications can use these keys.

PKI security was initially introduced in the 1990s to administer encryption keys via the issue and maintenance of digital certificates. These certificates are similar to a driver’s license or passport for the digital world.

To assist in maintaining security, these PKI certificates validate the owner of a private key and the legitimacy of that connection in the future.

In the modern world, PKI security examples include:

  • SSL certificates on websites.
  • Ensuring that information is sent securely.
  • Digital signatures.
  • Internet of Things authentication.

Below are some common use cases for PKI.

Server Identification

A PKI server identification certificate is used in the SSL handshake every time someone connects to a web server over HTTPS. PKI is used by millions of individuals who are unaware of it. The goal is for the server to establish its identity to the client as verifiable.

For instance, customers should double-check that they are contacting an Amazon server before entering their credit card information for online transactions.

Mail servers often use SSL, and it may also be used by nearly any socket-based client-server application for additional safety (encryption and ensuring that the server is what it claims to be). VPN equipment can also authenticate itself to VPN clients using PKI server identification certificates.

Web Application Authentication and Authorization

Usernames and passwords are commonly used for authentication. However, a PKI solution offers a more appealing option. Before creating a reliable and encrypted connection, SSL provides the opportunity of requiring a client-side certificate.

Before permitting an HTTPS connection to be made with a web server, it must first have a valid client certificate. However, it is seldom used since present solutions are insufficient, making management a nightmare.

Signing Documents and Electronic Forms

PKI may digitally “sign” electronic documents in addition to establishing user identification. This entails creating a hash value for the document’s contents and encrypting the hash value with an encrypted signature.

Only the owner of a certificate’s private key—just as each individual is the only one who may sign a paper document, can perform this signing action using PKI’s asymmetric keys.

However, just as everyone can validate a written signature, anybody can verify a PKI digital signature by confirming the hash value. Written signature verification isn’t nearly as exact or decisive as digital signature verification.

They can also use the certificate’s public key and suitable software to check that the document’s contents haven’t been changed.

This feature allows for paperless transactions that require individual permission. Verifiers electronically sign papers or forms and send them to the next phase. Signatures and document authenticity can be examined and acted on automatically or manually using the appropriate tools.

They might be signed by a single person or by a group of people. Digital signature offers considerable cost and time savings and improved dependability and security as the software develops and companies learn to use this potential.

PKI for IoT Security

IoT companies require encryption, authentication, and identification due to the exponential development in demand for digital certificates. This is where Public Key Infrastructure (PKI) enters the equation.

A set of hardware, software, regulations, and processes for issuing, administering, distributing, and upgrading digital certificates with time makes up the crucial public infrastructure. PKI has always been an essential part of security, and it is now emerging as a scalable solution for the security demands of IoT devices.

However, this might result in a more complicated issue without adequate deployment.

Email List Server

Using S/MIME (Secure/Multipurpose Internet Mail Extensions) has several intriguing ramifications for mail servers. It allows the server to authenticate procedures using S/MIME signatures, a helpful feature.

For instance, it can only permit selected users to post on specific lists. If users wish to send S/MIME secure emails to a list, they must cope with every receiver’s unique public key, requiring the email to be encrypted uniquely for each user.

S/MIME enabled list servers that maintain certificates with public keys for each user can automate this process by accepting encrypted messages with their public keys, decrypting them, then re-encrypting them with each recipient’s public key the message is forwarded.


Implementing PKI, especially for businesses, is crucial – but this is only the initial stage. It’s not simple to build and maintain a best-practice PKI program that maintains millions of digital certificates, but that’s the difficulty today’s businesses face.

By providing secure data and encrypted communications, and digital identity verification, PKI contributes to the security of our digital environment.

By Admin

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