A time stamp logically is an electronic seal including an official time indication applied over a document - any file format. In practice it is a part of digital signature, a unique fingerprint over a submitted digest - an official time indication. This is experimental RFC3161 client software. It bases on PKI Public Key Infrastructure. This client takes automatically official time signature from remote TSU TimeStamp Unit server. You can also verify any received and timestaped e-mails and file attachments.  

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