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2. Certificate authority - Wikipedia

   en.wikipedia.org/wiki/Certificate_authority

   Worldwide, the certificate authority business is fragmented, with national or regional providers dominating their home market. This is because many uses of digital certificates, such as for legally binding digital signatures, are linked to local law, regulations, and accreditation schemes for certificate authorities.

3. Certified email - Wikipedia

   en.wikipedia.org/wiki/Certified_email

   Certified email (known as Posta elettronica certificata in Italy, or PEC in short) is a special type of email in use in Italy, [1] Switzerland, [2] Hong Kong [3] and Germany. [4] Certified email is meant to provide a legal equivalent of the traditional registered mail , where users are able to legally prove that a given email has been sent and ...

4. Public key certificate - Wikipedia

   en.wikipedia.org/wiki/Public_key_certificate

   In cryptography, a public key certificate, also known as a digital certificate or identity certificate, is an electronic document used to prove the validity of a public key. [ 1 ] [ 2 ] The certificate includes the public key and information about it, information about the identity of its owner (called the subject), and the digital signature of ...

5. Use AOL Certified Mail to confirm legitimate AOL emails

   help.aol.com/articles/what-is-aol-certified-mail

   When you open the email, you'll also see the Certified Mail banner above the message details. When you get a message that seems to be from AOL, but it doesn't have those 2 indicators, and it isn't alternatively marked as AOL Official Mail, it might be a fake email. Make sure you mark it as spam and don't click on any links in the email.

6. Public key infrastructure - Wikipedia

   en.wikipedia.org/wiki/Public_key_infrastructure

   A registration authority (RA) which verifies the identity of entities requesting their digital certificates to be stored at the CA; A central directory—i.e., a secure location in which keys are stored and indexed; A certificate management system managing things like the access to stored certificates or the delivery of the certificates to be ...

7. Qualified digital certificate - Wikipedia

   en.wikipedia.org/wiki/Qualified_digital_certificate

   In the context of Regulation (EU) No 910/2014 , a qualified digital certificate is a public key certificate issued by a trust service provider which has government-issued qualifications. The certificate is designed to ensure the authenticity and data integrity of an electronic signature and its accompanying message and/or attached data.