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Introduction to the Time Stamp |
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A time stamp logically is an electronic seal including a time indication applied over a document.
In practice it's a digital signature over a submitted digest, a time indication and other informations.
The Time Stamping Protocol (RFC3161) defines the entities involved (the requestor or client and the Time Stamp Authority or server), the message format and the transport protocol which permits the communication between the entities. It's possible to locate two distinct phases, represented in the following figures
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Documentation about TSP (standard, draft and white papers) |
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This section contains links to some documents related to TSP. Documents from IETF:
Publicly available Time Stamp Authorities |
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This section contains a list of publicly available TSAs both for free of charge service and testing purposes:
| hostname:port, IP_address:port or URL | protocol | type of service | contact | TSA web page |
| tsp.test.polito.it:8318 | Pure TCP (RFC3161) | testing purposes | CNSG member (tsp-dev@security.polito.it) | http://security.polito.it/test/tsp/ |
| tsa.cryptoapps.com:3318 | Pure TCP (RFC3161) | testing purposes only | Peter Guttman (pgut001@cs.auckland.ac.nz ) | n/a |
| http://195.223.2.6:8080/timestamp 195.223.2.6:3318 |
HTTP (POST) TCP-RFC3161 |
testing purposes | C & A (tho@com-and.com) | http://195.223.2.6:8080 |
| testtsa.actalis.it:318 | Pure TCP (RFC3161) | testing purposes | Celestino Campopiano (celestino.campopiano@actalis.it) | n/a |
| http://timestamping.edelweb.fr/service/tsp https://clepsydre.edelweb.fr/dvcs/service-tsp https://www.openevidence.org/tsa/service-tsp |
HTTP (POST) HTTPS (POST) HTTPS (POST) |
testing purposes | (tsa@edelweb.fr) | http://timestamping.edelweb.fr |
| tsp.iaik.at:318 tsp.iaik.at:10318 http://tsp.iaik.at/tsp/TspRequest Port: 80 https://tsp.iaik.at/tsp/TspRequest Port: 443 |
Pure TCP SSL HTTP HTTPS |
testing purposes | Mario Ivkovic (mario.ivkovic@iaik.tugraz.at) | http://tsp.iaik.at |
| dse200.ncipher.com:318 | Pure TCP (RFC3161) HTTP (POST) |
testing purposes | Scott Mustard (scott@ncipher.com) | n/a |
| http://info.szikszi.hu:8080/tsa https://info.szikszi.hu:8443/tsa |
HTTP (POST) HTTPS (POST) |
testing purposes | Zoltan Glozik (info@opentsa.org) | http://www.opentsa.org/ |
Publicly available TSP software |
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This section contains a list of publicly available TSP software, open source, public domain, freeware or free of charge binaries:
| URL | type of licence | contact |
| http://security.polito.it/tools/tsp/ | free of charge, binaries only | CNSG member (tsp-dev@security.polito.it) |
| http://www.cs.auckland.ac.nz/~pgut001/cryptlib/index.html | free for non commercial use, sources | mailing list (cryptlib-request@mbsks.franken.de?Subject=Subscribe cryptlib ) |
| http://www.opentsa.org/ | same licence as OpenSSL, sources (OpenSSL patch) | Zoltan Glozik (info@opentsa.org) |