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  2. Public key infrastructure - Wikipedia

    en.wikipedia.org/wiki/Public_key_infrastructure

    Public key infrastructure. A public key infrastructure (PKI) is a set of roles, policies, hardware, software and procedures needed to create, manage, distribute, use, store and revoke digital certificates and manage public-key encryption. The purpose of a PKI is to facilitate the secure electronic transfer of information for a range of network ...

  3. United States fifty-dollar bill - Wikipedia

    en.wikipedia.org/wiki/United_States_fifty-dollar...

    series 1969C reverse September 28, 2004: A revised design of the $50 note was implemented, as Series 2004, with the first use of multiple colors since the 1905 $20 gold certificate. Around the new borderless portrait of President Grant appears a subtle, stylized blue and red background image of the American Flag. A small silver-blue star was ...

  4. Certificate in Teaching English to Speakers of Other Languages

    en.wikipedia.org/wiki/Certificate_in_Teaching...

    Certificate in Teaching English to Speakers of Other Languages. CELTA is an initial teacher training qualification for teaching English as a second or foreign language (ESL and EFL). It is provided by Cambridge Assessment English through authorised Cambridge English Teaching Qualification centres and can be taken either full-time or part-time.

  5. Security printing - Wikipedia

    en.wikipedia.org/wiki/Security_printing

    Security printing. Security printing is the field of the printing industry that deals with the printing of items such as banknotes, cheques, passports, tamper-evident labels, security tapes, product authentication, stock certificates, postage stamps, and identity cards. The main goal of security printing is to prevent forgery, tampering, or ...

  6. Academic certificate - Wikipedia

    en.wikipedia.org/wiki/Academic_certificate

    An academic certificate or tech certificate[1] is a document that certifies that a person has received specific education or has passed a test or series of tests. In many countries, a certificate is a qualification attained in secondary education. For instance, students in the Republic of Ireland sit the Junior Certificate and follow it with ...

  7. X.509 - Wikipedia

    en.wikipedia.org/wiki/X.509

    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. They are also used in offline applications, like electronic ...

  8. Teaching English as a second or foreign language - Wikipedia

    en.wikipedia.org/wiki/Teaching_English_as_a...

    On 15 March 2008, visa rules changed; prospective teachers must undergo a medical examination and a criminal background check, produce an original degree certificate, and provide sealed transcripts. On arrival in South Korea, teachers must undergo another medical check before they receive a resident registration number .

  9. Certificate policy - Wikipedia

    en.wikipedia.org/wiki/Certificate_policy

    Certificate policy. A certificate policy (CP) is a document which aims to state what are the different entities of a public key infrastructure (PKI), their roles and their duties. This document is published in the PKI perimeter. When in use with X.509 certificates, a specific field can be set to include a link to the associated certificate policy.