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  2. Trusted timestamping - Wikipedia

    en.wikipedia.org/wiki/Trusted_timestamping

    There are many timestamping schemes with different security goals: PKI-based – timestamp token is protected using PKI digital signature. Linking-based schemes – timestamp is generated in such a way that it is related to other timestamps. Distributed schemes – timestamp is generated in cooperation of multiple parties.

  3. Medallion signature guarantee - Wikipedia

    en.wikipedia.org/wiki/Medallion_signature_guarantee

    A medallion signature guarantee is a binding warranty, issued by an agent of the authorized guarantor institution, that: (a) the signature was genuine; (b) the signer was an appropriate person to endorse, and (c) the signer had legal capacity to sign. A medallion signature guarantee is not equivalent to a US notarial Acknowledgment. [1]

  4. What is a certified check? Definition, uses and cost - AOL

    www.aol.com/finance/certified-check-definition...

    A signature, stamp or some kind of marking shows that the check is certified. ... Even though a certified check is a more secure payment instrument than a standard personal check, counterfeits are ...

  5. Digital signature - Wikipedia

    en.wikipedia.org/wiki/Digital_signature

    A digital signature scheme is secure if for ... As organizations move away from paper documents with ink signatures or authenticity stamps, digital signatures can ...

  6. Security printing - Wikipedia

    en.wikipedia.org/wiki/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 counterfeiting.

  7. Time stamp protocol - Wikipedia

    en.wikipedia.org/wiki/Time_stamp_protocol

    The Time-Stamp Protocol, or TSP is a cryptographic protocol for certifying timestamps using X.509 certificates and public key infrastructure. The timestamp is the signer's assertion that a piece of electronic data existed at or before a particular time.