Trusted timestamping is the process of securely keeping track of the creation and modification time of a document. Security here means that no one—not even the owner of the document—should be able to change it once it has been recorded provided that the timestamper's integrity is never compromised.
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The administrative aspect involves setting up a publicly available, trusted timestamp management infrastructure to collect, process and renew timestamps.
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History[edit]
The idea of timestamping information is centuries old. For example, when Robert Hooke discovered Hooke's law in 1660, he did not want to publish it yet, but wanted to be able to claim priority. So he published the anagramceiiinosssttuv and later published the translation ut tensio sic vis (Latin for 'as is the extension, so is the force'). Similarly, Galileo first published his discovery of the phases of Venus in the anagram form.
Sir Isaac Newton, in responding to questions from Leibniz in a letter in 1677, concealed the details of his 'fluxional technique' with an anagram:
- The foundations of these operations is evident enough, in fact; but because I cannot proceed with the explanation of it now, I have preferred to conceal it thus: 6accdae13eff7i3l9n4o4qrr4s8t12ux. On this foundation I have also tried to simplify the theories which concern the squaring of curves, and I have arrived at certain general Theorems.
Classification[edit]
There are many timestamping schemes with different security goals:
- PKI-based - timestamp token is protected using PKI digital signature.
- Linking-based schemes - timestamp is generated such a way that it is related to other timestamps.
- Distributed schemes - timestamp is generated in cooperation of multiple parties.
- Transient key scheme - variant of PKI with short-living signing keys.
- MAC - simple secret key based scheme, found in ANSI ASC X9.95 Standard.
- Database - document hashes are stored in trusted archive; there is online lookup service for verification.
- Hybrid schemes - the linked and signed method is prevailing, see X9.95.
Coverage in standards:
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| Scheme | RFC 3161 | X9.95 | ISO/IEC 18014 |
|---|---|---|---|
| PKI | Yes | Yes | Yes |
| Linked | Yes | Yes | |
| MAC | Yes | ||
| Database | Yes | ||
| Transient key | Yes | ||
| Linked and signed | Yes |
For systematic classification and evaluation of timestamping schemes see works by Masashi Une.[1]
Trusted (digital) timestamping[edit]
According to the RFC 3161 standard, a trusted timestamp is a timestamp issued by a Trusted Third Party (TTP) acting as a Time Stamping Authority (TSA). It is used to prove the existence of certain data before a certain point (e.g. contracts, research data, medical records, ..) without the possibility that the owner can backdate the timestamps. Multiple TSAs can be used to increase reliability and reduce vulnerability.
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The newer ANSI ASC X9.95 Standard for trusted timestamps augments the RFC 3161 standard with. IMES Discussion Papers Series 2001-E-18.Cite journal requires |journal= (help)
External links[edit]
- RFC 3161 Internet X.509 Public Key Infrastructure Time-Stamp Protocol (TSP)
- RFC 3628 Policy Requirements for Time-Stamping Authorities (TSAs)
- ETSI TS 101 861 V1.4.1 Electronic Signatures and Infrastructures (ESI); Time stamping profile
- ETSI TS 102 023 V1.2.2 Electronic Signatures and Infrastructures (ESI); Policy requirements for time-stamping authorities
- Analysis of a Secure Time Stamp Device (2001) SANS Institute
- Implementation of TSP Protocol CMSC 681 Project Report, Youyong Zou