An extensive validation SSL certificate requires a longer checking process before it can be authorised. Because of this, it means that your website will be highly trusted by anyone that uses it.
99.9% browser compatibility
Browser and devices compatibility is the most important part of SSL usage.
$2,000,000 USD worth warranty
Claim $2,000,000 USD on failure properly validate the information contained in a digital certificate and that failure causes the end-user to lose money.
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Elliptic Curve Cryptography
Smaller key size and certificate, make faster turn around.