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In cryptography, X.509 is an International Telecommunication Union (ITU) standard defining the format of public key certificates. [1] X.509 certificates are used in many Internet protocols, including TLS/SSL, which is the basis for HTTPS, [2] the secure protocol for browsing the web.
On November 18, 2014, a group of companies and nonprofit organizations, including the Electronic Frontier Foundation, Mozilla, Cisco, and Akamai, announced Let's Encrypt, a nonprofit certificate authority that provides free domain validated X.509 certificates as well as software to enable installation and maintenance of certificates. [14]
A medical certificate or doctor's certificate [1] [2] is a written statement from a physician or another medically qualified health care provider which attests to the result of a medical examination of a patient. [3] It can serve as a sick note (UK: fit note) (documentation that an employee is unfit for work) or evidence of a health condition. [4]
An advanced professional certificate is a result of an educational process designed for individuals. Certificates are designed for both newcomers to the industry as well as seasoned professionals. Certificates are awarded by an educational program or academic institution. Completion of a certificate program indicates completion of a course or ...
In computer security, an attribute certificate, or authorization certificate (AC) is a digital document containing attributes associated to the holder by the issuer. [1] When the associated attributes are mainly used for the purpose of authorization, AC is called authorization certificate. AC is standardized in X.509. RFC 5755 further specifies ...
Certificate may refer to: Birth certificate; Marriage certificate; Death certificate; Gift certificate; Certificate of authenticity, a document or seal certifying the authenticity of something; Certificate of deposit, or CD, a financial product commonly offered to consumers by banks, thrift institutions and credit unions; Investment 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 ...
Type approval or certificate of conformity is granted to a product that meets a minimum set of regulatory, technical and safety requirements. Generally, type approval is required before a product is allowed to be sold in a particular country, so the requirements for a given product will vary around the world.
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