ITPEC FE Morning April 2019 Question 39
ITPEC FE Morning April 2019 — Question 39 of 80
Time Stamp Service — certifies data existence and integrity at a specific point in time.
A time stamp service (provided by a Time Stamp Authority, TSA) proves two things: that electronic data existed at a certain date and time, and that the data has not been tampered with since then. It works by creating a cryptographic timestamp tied to a hash of the data.
Correct answer: b) — It certifies that electronic data certainly exist on a particular date and time and that the data have not been falsified since that date and time.
Why not others:
- a) Describes biometric authentication — unrelated to timestamping.
- c) Describes NTP (Network Time Protocol) — secure clock synchronization, not data integrity certification.
- d) Describes a web service that merely displays time via encrypted communication — no data integrity guarantee.
Key rule: Time stamp service = proof of existence + proof of integrity at a specific moment. Think of it as a digital notary for data.
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