{"id":196,"date":"2022-10-24T08:00:00","date_gmt":"2022-10-24T08:00:00","guid":{"rendered":"https:\/\/cheapsslweb.com\/blog\/?p=196"},"modified":"2024-09-24T11:17:26","modified_gmt":"2024-09-24T11:17:26","slug":"what-is-pki-certificate","status":"publish","type":"post","link":"https:\/\/cheapsslweb.com\/blog\/what-is-pki-certificate\/","title":{"rendered":"What is PKI Certificate? [A Detailed Guide]"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Understanding PKI Certificates as a beginner in cybersecurity doesn\u2019t have to be hard.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">While browsing your device settings or the internet, you\u2019ve likely encountered something called \u201ccertificates\u201d. These certificates aren\u2019t quite different from certificates you may have earned for completing a course or winning a competition showing proof of your accomplishment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is because their purpose is to verify the integrity of the communication over a network. Before learning what certificates are or how they work, it is essential to go over the basics of Public Key Encryption.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is Public Key Encryption?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Public key encryption is also called <a href=\"https:\/\/cheapsslweb.com\/blog\/what-is-asymmetric-encryption-how-does-it-work\">asymmetric encryption<\/a> because it uses different keys for encryption and decryption. The receiver sends the sender a public key, which is used for encryption. The sender uses this key to encrypt the message, which the receiver can decrypt with their private key, which is never shared.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This inherently makes the encryption less vulnerable to hacking attempts from methods such as man-in-the-middle attacks. In such attacks, the hacker intercepts the network and gains access to the key. In private key encryption, the same key is used for encryption and decryption; therefore, the hacker can decrypt the communication easily.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Public key cryptography is also invulnerable to brute force attacks that attempt to derive the private key from the public key. This is because the public key is generated from the private key using an irreversible mathematical equation that makes it impossible to derive the private key using the public key.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can Public Key Encryption be Intercepted?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">While public key encryption is less vulnerable than private key encryption, it can still be intercepted differently. Since both parties need access to public keys, they are shared over an unencrypted network. Using a man-in-the-middle attack, the hacker would intercept the network before it is encrypted.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This would allow the hacker to encrypt messages and send them to either party while pretending to be the other party in the network. This can be used to share all kinds of malicious code, such as spyware and ransomware. To avoid such attacks, networked machines need a way to verify each message&#8217;s authenticity.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Certificates: A Way to Verify Integrity<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Certificates are essential for verifying the authenticity and integrity of each message across a network. They allow the receiver to verify the sender&#8217;s identity for essential communications such as banking transactions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">There are a few different terms we should go over before proceeding any further:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Certificate Authority<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The Certificate Authority issues digital security certificates using its public key and stores them.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Registration Authority<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A Registration Authority verifies the identity of the entity requesting a digital security certificate. Sometimes, the Certificate Authority may also act as a Registration Authority.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Certificate Database<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The Certificate Database stores all the information about certificates issued, such as their validity and metadata.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Certificate Policy<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The Certificate Policy shows the certificate\u2019s procedures and how reliable it is for certain communication.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What is the PKI Certificate?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Now that you understand the basics of certificates, let\u2019s address the topic at hand &#8211; PKI Certificates. A PKI Certificate or Public Key Infrastructure Certificate is used to authenticate several web users, devices, and servers. Its most common uses include <a href=\"https:\/\/cheapsslweb.com\/code-signing-certificates\">sign a code with code signing certificate<\/a>, important documents, and email-based communication.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Moreover, it can also encrypt data when shared across an unsecured network such as Public WiFi. PKI is essential to protecting secured networks from being intercepted by imposters. Today, it is one of the most critical components of HTTPS communication.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How Does the PKI Certificate Work?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">PKI generally works by reversing the keys&#8217; roles in asymmetric encryption. This means that the digital security certificate owner uses the private key to encrypt the certificate, and the public key shared beforehand is used to decrypt and verify the certificate.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Since the private key used for encrypting the certificate isn\u2019t shared, no impostor can encrypt a fake certificate and pretend to be the sender. Since the keys are mathematically linked, only the public key shared by the sender can decrypt the certificate encrypted by their private key.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If the receiver gets a message in which the certificate cannot get decrypted via the sender\u2019s public key, it is proof that the message is from an impostor.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Where is PKI Used Today?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">PKI is used today in several types of communications. For example, any website you use with an HTTPS URL is bound to be verified via a PKI certificate. Each CA also needs certificates that are issued by other CAs. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This process is repeated until the Root Certificate is self-signed. Root Certificates are issued by one of four major entities: Google, Apple, Microsoft, and Mozilla. The Mozilla Certificate has the strictest standards and is usually considered trustworthy.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Final Thoughts<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">As you can see, even public key encryption would be quite unsafe without using certificates. They are irreplaceable in our modern internet structure and necessary for obtaining HTTPS URLs on any website.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Understanding PKI Certificates as a beginner in cybersecurity doesn\u2019t have to be hard. While browsing your device settings or the internet, you\u2019ve likely encountered something called \u201ccertificates\u201d. These certificates aren\u2019t quite different from certificates you may have earned for completing a course or winning a competition showing proof of your accomplishment. This is because their&hellip; <a class=\"more-link\" href=\"https:\/\/cheapsslweb.com\/blog\/what-is-pki-certificate\/\">Continue reading <span class=\"screen-reader-text\">What is PKI Certificate? [A Detailed Guide]<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":2142,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[29],"class_list":["post-196","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-encryption-web-security","tag-what-is-pki-certificate","entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What is PKI Certificate? 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