https://www.yandex.ru/support/webmaster/en/service/certification
How to check for SSL/TLS site certificates | Webmaster
SSL/TLS certificates are used for securely processing user data and are necessary for sites that use HTTPS.
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https://blog.citp.princeton.edu/2008/12/30/researchers-show-how-forge-site-certificates/
Researchers Show How to Forge Site Certificates - CITP Blog
Dec 30, 2008 - Today at the Chaos Computing Congress, a group of researchers (Alex Sotirov, Marc Stevens, Jake Appelbaum, Arjen Lenstra, Benne de Weger, and David Molnar)...
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https://www.positivessl.com/
PositiveSSL® - The Official PositiveSSL® Site | PositiveSSL Certificates
Positive SSL Certificates provide a quick, cost effective solution for secure online transactions on websites. Buy Strength 2048-bit digital certificates.
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https://shaaaaaaaaaaaaa.com/
SHAAAAAAAAAAAAA | Check your site for weak SHA-1 certificates.
(Retired.) Check a site to see if it's still using dangerously weak SHA-1 certificates. Open source tool by @konklone.
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