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Upon the receipt and successful verification of the signature on the MDN, the original sender will "know" that the recipient got their message (this provides the "Non-repudiation" element of AS2). If there are any problems receiving or interpreting the original AS2 message, a "failed" MDN may be sent back.
In law, non-repudiation is a situation where a statement's author cannot successfully dispute its authorship or the validity of an associated contract. [1] The term is often seen in a legal setting when the authenticity of a signature is being challenged. In such an instance, the authenticity is being "repudiated". [2]
In the case of a qualified electronic signature as defined in the eIDAS-regulation, the signer's identity is even certified by a qualified trust service provider. This linking of signature and authentication firstly supports the probative value of the signature – commonly referred to as non-repudiation of origin. The protection of the message ...
Support for message-level security including various combinations of XML Digital Signature and/or XML Encryption; Support for X.509 security tokens and username/password tokens; Support for business receipt of non-repudiation similar to the Message Disposition Notification (MDN) [5] used by AS2 and specified as an XML schema by the ebXML BPSS group
Further, some non-repudiation schemes offer a timestamp for the digital signature, so that even if the private key is exposed, the signature is valid. [ 18 ] [ 19 ] Digitally signed messages may be anything representable as a bitstring : examples include electronic mail, contracts, or a message sent via some other cryptographic protocol.
Signed messages also provide non-repudiation. How to encrypt SOAP messages to assure confidentiality. How to attach security tokens to ascertain the sender's identity. The specification allows a variety of signature formats, encryption algorithms and multiple trust domains, and is open to various security token models, such as: X.509 certificates,
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One way to address non-repudiation is using digital signatures. [17] A digital signature not only ensures that a message or document has been electronically signed by the person, but since a digital signature can only be created by one person, it also ensures that this person cannot later deny that they provided their signature. [19]