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2. Digital signature - Wikipedia

   en.wikipedia.org/wiki/Digital_signature

   A digital signature is a mathematical scheme for verifying the authenticity of digital messages or documents. A valid digital signature on a message gives a recipient confidence that the message came from a sender known to the recipient. [1] [2]

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. Schnorr signature - Wikipedia

   en.wikipedia.org/wiki/Schnorr_signature

   In cryptography, a Schnorr signature is a digital signature produced by the Schnorr signature algorithm that was described by Claus Schnorr. It is a digital signature scheme known for its simplicity, among the first whose security is based on the intractability of certain discrete logarithm problems. It is efficient and generates short ...

5. Ring signature - Wikipedia

   en.wikipedia.org/wiki/Ring_signature

   Here the sender and the recipient of a message form a group for the ring signature, then the signature is valid to the recipient, but anyone else will be unsure whether the recipient or the sender was the actual signer. Thus, such a signature is convincing, but cannot be transferred beyond its intended recipient.

6. Elliptic Curve Digital Signature Algorithm - Wikipedia

   en.wikipedia.org/wiki/Elliptic_Curve_Digital...

   The signature is valid if , matches Alice's public key. The signature is invalid if all the possible R points have been tried and none match Alice's public key. Note that an invalid signature, or a signature from a different message, will result in the recovery of an incorrect public key.

7. Message authentication code - Wikipedia

   en.wikipedia.org/wiki/Message_authentication_code

   In contrast, a digital signature is generated using the private key of a key pair, which is public-key cryptography. [4] Since this private key is only accessible to its holder, a digital signature proves that a document was signed by none other than that holder. Thus, digital signatures do offer non-repudiation.