Quiz Entry - updated: 2026.08.02
For each application, which of confidentiality, integrity, and authenticity are required: a digital public archive, Pay-TV data transmission, and an electronic signature?
A public archive needs authenticity/integrity; Pay-TV needs confidentiality; an electronic signature needs authenticity/integrity — only Pay-TV needs secrecy.
| Application | Confidentiality | Data Authenticity / Integrity |
|---|---|---|
| Digital public archive | No — it's public | Yes — must prove documents haven't been tampered with |
| Pay-TV broadcast | Yes — only paying subscribers should be able to view the content | Secondary — the scenario is treated as a confidentiality problem (stream integrity is a lesser concern) |
| Electronic signature | No — the signed document may be public | Yes — must prove who signed it and that it hasn't changed |
Key insight: Not every application needs confidentiality! Many real-world systems primarily need authenticity and integrity rather than secrecy. It is widely expected that the proportion of cryptographic user authentication applications will increase significantly over time.