Recipients of documents can verify when the document was electronically signed, as well as verify that the document was not altered after the date the timestamp vouches for. Electronically Signing DocumentsĮlectronic signatures are quickly being adopted globally and across various industries however, for an electronic signature to have the same legally binding value of a wet ink signature, it must satisfy the requirements of the law including compliance and auditability requirements. Trusted Timestamps add extra security to electronic signatures, digital signatures and code. What Type of Transactions Are Timestamps Most Commonly Used For? If any changes have been made to the data since the timestamp was applied, this hash check will fail and warning messages will be shown saying that the data has been altered and it should not be trusted. This new hash is compared to the originally created hash (step 1 above). validate that the timestamp came from a trusted TSA) and re-calculate a hash of the original data.
When the resulting timestamped data or file is opened in the future, the client application will use the TSA’s public key to authenticate the TSA (i.e.
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The timestamp token is received by the client application and recorded within the document or code signature.The timestamp token contains the information the client application will need to verify the timestamp later. The result is digitally signed with the TSA’s private key, creating a timestamp token which is sent back to the client. The TSA combines the hash and other information, including the authoritative time.From now on, any change (even by a single bit of information) in the original file will require communication of changes with the TSA server.The client application creates a hashed value (as a unique identifier of the data or file that needs to be timestamped) and sends it to the TSA.Here is a high level summary of the steps involved. TSAs use Public Key Infrastructure (PKI) technology to apply timestamps. RFC 3161 outlines the requirements a third party must meet in order to operate as a Timestamping Authority (TSA). Trusted timestamping means that you can say with a high level of certainty that the date on the timestamp is accurate and hasn’t been tampered with. These types of timestamps are generated by a trusted third party using secure FIPS-compliant hardware, so they are not subject to manipulation by a local user. This is where ‘trusted’ timestamping comes in. So, how do we know if we can trust the timestamp? What is a Trusted Timestamp? Plus, there are a variety of tools online that will allow you to change the modified, created and last accessed date of a document or PDF. Timestamps that rely on system clocks are not enough, since it’s not difficult to alter the date and time locally on a machine. If your argument comes down to when the NDA was signed, you need to be able to prove that the timestamp of the signature is valid, that it says the document was signed when it was actually signed. In a legal setting like this, it’s not enough to just have a timestamp. Knowing when that document was actually signed is essential here. The contractor disputes the NDA, arguing that information was shared prior to the signing of the NDA.
Later down the line, it is discovered that the contractor has leaked information about the project under which the NDA was signed. Imagine this scenario: your organization electronically signs a legal agreement or NDA with another organization or contractor. But in some cases, a timestamp is more valuable. In many cases, these records are simply useful for us to know about. Timestamps are important for keeping records of when information is being exchanged or created or deleted online. A social media post may have date and time recorded. A digital camera will record the time and date of a photo being taken, a computer will record the time and date of a document being saved and edited. When the date and time of an event is recorded, we say that it is timestamped.
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