Aloaha time stamping

Digital certificates expire after some period of time, such as one year, and a document signed with an expired key should not be accepted. However, there are many cases where it is necessary for signed documents to be regarded as legally valid for much longer than the certificate validity; long-term leases and contracts are examples. By registering the contract with a digital time-stamping authority (TSA) at the time it is signed, the signature can be validated even after
the key expires.  

If all parties to the contract keep a copy of the time-stamp, each can prove that the contract was signed with valid keys. Very important is the fact that the timestamp can prove the validity of a contract even if a signer's key gets compromised at some point after the contract was signed.
 
Aloaha signed documents can be validated with the free Adobe Reader. It shows right away if the signature time of the document has been validated by a timestamping authority. 

Normal signed PDF Document above, time stamped document below

Configure Aloaha time stamping

All signature capable Aloaha Tools are able to time stamp the digital signature. 

To enable automatic timestamping of digital signatures please click on the button with the clock in the digital signature settings dialog. Please read also the document below for further details:

http://www.aloaha.com/cache/time-stamping-pdf-documents.pdf


Time Stamping PDF Documents (272,42 KB)