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2. Trusted timestamping - Wikipedia

   en.wikipedia.org/wiki/Trusted_timestamping

   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. Transient key scheme – variant of PKI with short-living signing keys.

3. XAdES - Wikipedia

   en.wikipedia.org/wiki/XAdES

   An electronic signature that has been created in compliance with eIDAS has the same legal value as a handwritten signature. [2] An electronic signature, technically implemented based on XAdES has the status of an advanced electronic signature. [4] This means that it is uniquely linked to the signatory; it is capable of identifying the signatory;

4. Time stamp protocol - Wikipedia

   en.wikipedia.org/wiki/Time_stamp_protocol

   The timestamp is the signer's assertion that a piece of electronic data existed at or before a particular time. The protocol is defined in RFC 3161. One application of the protocol is to show that a digital signature was issued before a point in time, for example before the corresponding certificate was revoked.

5. Lamport signature - Wikipedia

   en.wikipedia.org/wiki/Lamport_signature

   In cryptography, a Lamport signature or Lamport one-time signature scheme is a method for constructing a digital signature. Lamport signatures can be built from any cryptographically secure one-way function ; usually a cryptographic hash function is used.

6. CAdES (computing) - Wikipedia

   en.wikipedia.org/wiki/CAdES_(computing)

   This level combines the old -BES and -EPES levels. This form extends the definition of an electronic signature to conform to the identified signature policy; CAdES-T: B-Level for which a Trust Service Provider has generated a trusted token (time-mark or time-stamp token) proving that the signature itself actually existed at a certain date and time.

7. Customize your signature in AOL Mail

   help.aol.com/articles/customize-your-siganture...

   AOL Mail provides a comprehensive set of tools designed to help you craft a distinctive and memorable email signature. Whether you're personalizing fonts, adding images, or formatting text, AOL Mail offers a wide range of options to ensure your signature reflects your unique style and professionalism. Add a signature