# How does this virus link work?

**URL:** <https://boards.straightdope.com/t/how-does-this-virus-link-work/1023354>\
**Category:** Factual Questions\
**Created:** [September 24, 2025, 10:37am UTC](https://boards.straightdope.com/t/how-does-this-virus-link-work/1023354 "2025-09-24T10:37:35Z")\
**Posts on this page:** 1\
**Page:** 2

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**Author:** ![FinsToTheLeft](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/finstotheleft/32/2930_2.png) [@FinsToTheLeft](https://boards.straightdope.com/u/FinsToTheLeft)\
**Post date:** [September 25, 2025, 11:36pm UTC](https://boards.straightdope.com/t/how-does-this-virus-link-work/1023354/21 "2025-09-25T23:36:52Z")

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> [@md-2000](#):
>
> The theory of certs as I remember from a decade ago, was that all certificates include a link to a base authority, and so are verified by a chain back to a few base certificates (I.e. ths site is verified because the certificate is verified by that certificate authority).

The biggest difference is that Back In The Day, they were pushing Extended Validation (EV) certificates. You may remember them as [Green Bar](https://www.ssldragon.com/blog/green-bar-ssl/) certificates. These certified that the company presenting the certificate was who they said they were. Less stringent were Organizational Validation (OV) and finally Domain Validation (DV) certificates. They are all the same when it comes to encryption between server and user.

The vast majority of certificates out there are DV only.

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