Certificate Authorities (CA) play a key role when obtaining a digital security certificate. They are similar to driving licensing authorities but for the digital world where they verify the business identity before issuing any security certificate. They validate the website, devices, and people who requested the designated certificate.<\/p>\n\n\n\n
The CA validation process ensures that end-users are interacting with who they think they are interacting with and not with others. <\/p>\n\n\n\n
Certificate Authorities are trusted third parties that issue digital security certificates such as SSL, code signing, etc. They manage public keys and other credentials for data encryption and validate entities such as websites, email addresses, companies, and others and bind them to cryptographic keys.<\/p>\n\n\n\n
The CA is responsible for authenticating the company information and providing it with unique certificates. But before issuing the certificate, the CA will check with the Qualified Information Source (QIS) to validate the information supplied by the applicant.<\/p>\n\n\n\n
The digital certificates offered by them will do the following things:<\/strong><\/p>\n\n\n\n As mentioned, the primary role of the CA is to validate the identity of the entities the certificate is being issued to. CAs have multiple crucial roles as they are an integral part of PKI. Here they are:<\/strong><\/p>\n\n\n\n CAs charge a nominal fee to the applicants for conducting validation and issuing the certificate. Their primary customers are server administrators and site owners who require these security certificates to configure their servers for secure communications.<\/p>\n\n\n\n Typically, you\u2019d have to generate a key pair that includes a private and public key. Also, you\u2019d have to generate a CSR (Certificate Signing Request), an encoded file that includes the public key and other data such as domain name, email, organization, etc.<\/p>\n\n\n\n The information included in the CSR varies depending on the validation type and the certificate’s use case. The private key provided to the applicant is kept secure and should never be shown to anyone, even to the CA.<\/p>\n\n\n\n Once the CSR is generated, send it to the CA for verification to digitally sign and issue the certificate to you. The key part of this issued certificate is called a chain of trust.<\/p>\n\n\n\n In digital security certificates, the certificate’s validity is verified through certificate hierarchy. This hierarchy is known as the chain of trust, where certificates higher up will issue and sign the certificates. The chain of trust consists of:<\/strong><\/p>\n\n\n\n You can easily check the chain of trust by inspecting the SSL\/TLS certificate in a browser, where you\u2019ll find the same breakdown. It\u2019ll include a trust anchor, intermediate certificate, and applicant certificate. Each validation point is backed by the previous layer\u2019s validity from the trust anchor.<\/p>\n\n\n\n Chain of trust is essential as it ensures security, scalability, and standard compliance while maintaining privacy and trust for those who rely on the applicant certificate. For a complete chain of trust, it becomes necessary for a certificate to successfully confer CA\u2019s trust.<\/p>\n\n\n\n A trust anchor is the root Certificate Authority (CA) that establishes the chain of trust. The validation of the rest of the chain’s layers depends on the trust anchor’s validation.<\/p>\n\n\n\n Major software companies will include the root certificate in their browser and operating system if the CA is publicly trusted.<\/p>\n\n\n\n Doing so ensures that the certificate in the chain leads back to the root CA certificate, which the browser trusts.<\/p>\n\n\n\n The root CA signs the intermediate certificate and provides the flexibility to validate the trust anchor, intermediate, and applicant certificate. Intermediate certificates have an administrative function and are used for a specific purpose, for instance, issuing SSL\/TLS or code signing certificates.<\/p>\n\n\n\n Intermediate certificates also work as a buffer for root CA and applicant certificates and help protect the root key from getting compromised. <\/p>\n\n\n\n CA\/B forum\u2019s Baseline Requirement forbids the trusted CA<\/a> to issue applicant certificates from the root CA directly. Thus, there will always be one intermediate certificate in the root CA\u2019s chain of trust.<\/p>\n\n\n\n The applicant or end-entity certificate is the final layer in the chain of trust. It confers the CA\u2019s trust in the applicant\u2019s business, website, or person using the intermediate certificate in the chain.<\/p>\n\n\n\n The applicant certificate differs greatly from the intermediate certificate or trust anchor because it can\u2019t be utilized for issuing additional certificates. The chain of trust ends here as the applicant certificate is the final layer.<\/p>\n\n\n\n Certificate authorities issue several certificates based on the applicant\u2019s requirements. For instance, here are some of the digital security certificates offered by the CAs:<\/p>\n\n\n\n A Secure Socket Layer is a security protocol used for encrypting the user session between the web server and web browser. The SSL\/TLS certificate<\/a> is used for the authentication of the website\u2019s owner to generate encrypted HTTPS connections.<\/p>\n\n\n\n It prevents cybercriminals from reading or modifying the information transferred between two systems by keeping the internet connection secure. A padlock sign on the website you visit indicates that it\u2019s protected by the SSL certificate issued by a trusted certificate authority.<\/p>\n\n\n\n A code signing certificate<\/a> is another digital security certificate offered by a trusted CA to authenticate the identity of a software\/code publisher. It binds the identity of a business with the public key, which is mathematically related to a private key.<\/p>\n\n\n\n The certificate uses the private and public key networks known as Public Key Infrastructure (PKI)<\/a>. The developers will sign the code with a private key, which they keep private with themselves, while the end-user will use the public key to verify the developer\u2019s identity.<\/p>\n\n\n\n Since emails are an integral part of our lives, an email digital signature certificate or email signing certificate enhances email security. It\u2019s an S\/MIME certificate<\/a> based on the PKI network that enables you to sign and encrypt the contents of an email digitally.<\/p>\n\n\n\n It uses asymmetric encryption keys to encrypt email messages or their attachments. The email signing certificate will ensure that the emails are secure in transit or at rest. The hashing function in an email signing will alert the recipient if it\u2019s been altered.<\/p>\n\n\n\n It\u2019s used to sign an object to verify its integrity and ownership digitally. CA-issued certificates are used to sign various objects, including objects in the integrated file system.<\/p>\n\n\n\n For proper authentication of the object signature, the receiver of the signed object must have access to the corresponding certificate.<\/p>\n\n\n\n These types of certificates validate the user or clients who own the certificate. They are primarily used by digital applications to validate users from a certificate rather than a username & password combination. CAs have started offering such certificates for users to authenticate themselves and easily access the apps.<\/p>\n\n\n\n Several renowned Certificate Authorities like Comodo, DigiCert, Sectigo, and DigiCert offer a wide range of code signing certificates for your software\/code authentication. They offer different certificates based on your business and validation type, for instance, Individual, Organization, or Extended.<\/p>\n\n\n\n Individual and Organization Validation certificates<\/a> are almost identical in features and benefits they offer. Extended Validation goes a step further for validation, where a CA asks for certain documents to prove your business’s legality and legitimacy.<\/p>\n\n\n\n\n
Role of Certificate Authorities<\/h2>\n\n\n\n
\n
What is the Chain of Trust?<\/h2>\n\n\n\n
\n
What is Trust Anchor?<\/h3>\n\n\n\n
What is an Intermediate Certificate?<\/h3>\n\n\n\n
What is an Applicant Certificate?<\/h3>\n\n\n\n
What Types of Certificates are Offered by CAs<\/h2>\n\n\n\n
SSL\/TLS Certificate<\/h3>\n\n\n\n
Code Signing Certificate<\/h3>\n\n\n\n
Email Signing Certificate<\/h3>\n\n\n\n
Object Signing Certificate<\/h3>\n\n\n\n
User\/Client Certificate Signing<\/h3>\n\n\n\n
How Can I Get Code Signing Certificate from Trusted Certificate Authority?<\/h2>\n\n\n\n