Trusted Certificate

Trusted Certificate refers to Trusted Root Certificate that forms the basis for issuing an SSL Certificate. A Trusted Root Certificate is generally owned by a Certification Authority (CA) that has rights to issue SSL certificates.

A Trusted Certificate or Trusted Root Certificate is an unsigned public key certificate, or a self-signed certificate. Such a certificate forms part of a public key infrastructure scheme. A Root Certificate is considered to be a highly trusted certificate because it is usually included in almost all applications that support security certification.

For an SSL certificate to be trusted, it must be a Single Root certificate and must originate from a CA that owns a Trusted Root CA Certificate. A Single Root Certificate is one that is based directly on a Trusted Root CA Certificate and does not require any additional validation before reaching the Root Certificate from which it is issued. Such an SSL certificate will have high browser “ubiquity” and will work at industry standard encryption levels.

Browser ubiquity for a trusted certificate denotes the number or percentage of all browsers that actually recognise the SSL certificate. All browsers have an internal list of Trusted Root Certificates and CAs already included in their records by the vendors. An SSL certificate issued by a CA that is present in all the major browsers would be a highly trusted one. This is because vendors tend to include only those CAs in their trusted list which have been around for a good duration and which the vendors know are stable and trustworthy.

The SSL certificate also needs to work at high levels of encryption – current industry standard is 128 Bit or 256 Bit – for it to be trusted. When an SSL certificate provides either 128 Bit or 256 Bit encryption, the data transmitted through that SSL certificate is almost impossible to decipher by anyone not holding the key to the encryption.

Every trusted certificate has two keys – a public one and a private one. The private key is held by the CA and is recorded in their server. A private key generated from this key is issued to the website owner who orders an SSL certificate. The public key on the other hand is provided to browser vendors and other application developers for inclusion in their trusted lists. Only when the two keys match and get validated is an SSL certificate recognised and secure data transmission takes place.

Among the trusted root certificates available today are the SSL certificates issued by major CAs such as VeriSign, GeoTrust, RapidSSL and Thawte. All of these CAs have been around for a long time and are recognised by all browser vendors as being trustworthy and stable. As a result, the SSL certificates issued by these CAs are accepted by 99.9% of all browsers and considered to be highly secure and trusted.

If you own an e-commerce website and require SSL certification for it, you should make sure you get a trusted certificate. For this you must check the credentials of the CA you order the certificate from and ensure that you don't order a Chained Root Certificate.

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