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| -rw-r--r-- | doc/claimant.md | 57 |
1 files changed, 34 insertions, 23 deletions
diff --git a/doc/claimant.md b/doc/claimant.md index c10e657..b98f2ad 100644 --- a/doc/claimant.md +++ b/doc/claimant.md @@ -1,37 +1,48 @@ # Claimant model -## **System<sup>CHECKSUM</sup>**: -System<sup>CHECKSUM</sup> is about the claims made by a _data publisher_. +## **System<sup>CHECKSUM</sup>** +System<sup>CHECKSUM</sup> is about the claims made by a data publisher. * **Claim<sup>CHECKSUM</sup>**: _I, data publisher, claim that the data_: 1. has cryptographic hash X - 2. can be located using X as an identifier - 3. has properties Y (_"ecosystem specific_") + 2. is produced by no-one but myself * **Statement<sup>CHECKSUM</sup>**: signed checksum<br> * **Claimant<sup>CHECKSUM</sup>**: data publisher<br> The data publisher is a party that wants to publish some data to an end-user. * **Believer<sup>CHECKSUM</sup>**: end-user<br> Belief is based on seeing a valid Statement<sup>CHECKSUM</sup>. -* **Verifier<sup>CHECKSUM</sup>**: any interested party<br> - These parties try to verify the above claims. For example: - * the data publisher itself (_"has my identity been compromised?"_) - * third-parties that want to look further into the data (_"ecosystem - specific_") +* **Verifier<sup>CHECKSUM</sup>**: data publisher<br> + The data publisher tries to detect unwanted statements. * **Arbiter<sup>CHECKSUM</sup>**:<br> There's no official body. Invalidated claims would affect reputation. -**Example.** -The published data could be an executable binary from a reproducible build. The -ecosystem-specific claim would be that the corresponding source code can be -looked-up in a public database using X as an identifier. A rebuilder would -verify this claim by compiling the source, comparing the hashed output to the -claimed value. +System<sup>CHECKSUM\*</sup> can be defined to make more specific claims. Below +is a reproducible builds example. + +### **System<sup>CHECKSUM-RB</sup>**: +System<sup>CHECKSUM-RB</sup> is about the claims made by a _software publisher_ +that makes reproducible builds available. +* **Claim<sup>CHECKSUM-RB</sup>**: + _I, software publisher, claim that the data_: + 1. has cryptographic hash X + 2. is the output of a reproducible build for which the source can be located + using X as an identifier +* **Statement<sup>CHECKSUM-RB</sup>**: Statement<sup>CHECKSUM</sup> +* **Claimant<sup>CHECKSUM-RB</sup>**: software publisher<br> +* **Believer<sup>CHECKSUM-RB</sup>**: end-user<br> + Belief is based on seeing a valid Statement<sup>CHECKSUM-RB</sup>. +* **Verifier<sup>CHECKSUM-RB</sup>**: any interested party<br> + These parties try to verify the above claims. For example: + * the software publisher itself (_"has my identity been compromised?"_) + * rebuilders that check for locatability and reproducibility +* **Arbiter<sup>CHECKSUM-RB</sup>**:<br> + There's no official body. Invalidated claims would affect reputation. ## **System<sup>CHECKSUM-LOG</sup>**: System<sup>CHECKSUM-LOG</sup> is about the claims made by a _log operator_. -It adds _discoverability_ into System<sup>CHECKSUM</sup>. Discoverability means -that Verifier<sup>CHECKSUM</sup> can see all Statement<sup>CHECKSUM</sup> that -Believer<sup>CHECKSUM</sup> will accept. +It adds _discoverability_ into System<sup>CHECKSUM\*</sup>. Discoverability +means that Verifier<sup>CHECKSUM\*</sup> can see all +Statement<sup>CHECKSUM</sup> that Believer<sup>CHECKSUM\*</sup> accept. * **Claim<sup>CHECKSUM-LOG</sup>**: _I, log operator, make available:_ @@ -42,12 +53,12 @@ Believer<sup>CHECKSUM</sup> will accept. * a small subset of data publishers * members of relevant consortia * **Believer<sup>CHECKSUM-LOG</sup>**: - Believer<sup>CHECKSUM</sup> and - Verifier<sup>CHECKSUM</sup><br> + Believer<sup>CHECKSUM\*</sup> and + Verifier<sup>CHECKSUM\*</sup><br> Belief is based on two factors: 1. seeing a valid Statement<sup>CHECKSUM-LOG</sup> 2. seeing a number of valid Statement<sup>CHECKSUM-WITNESS</sup> from - independent instances on System<sup>CHECKSUM-WITNESS</sup>. + independent instances of System<sup>CHECKSUM-WITNESS</sup>. * **Verifier<sup>CHECKSUM-LOG</sup>**: System<sup>CHECKSUM-WITNESS</sup><br> Witnesses verify the log's append-only property from their own local vantage point(s). @@ -73,8 +84,8 @@ _trustworthy_. * monitors (cross-ecosystem) * a small subset of data publishers (cross-ecosystem) * **Believer<sup>CHECKSUM-WITNESS</sup>**: - Believer<sup>CHECKSUM</sup> and - Verifier<sup>CHECKSUM</sup><br> + Believer<sup>CHECKSUM\*</sup> and + Verifier<sup>CHECKSUM\*</sup><br> Belief is based on seeing a valid Statement<sup>CHECKSUM-WITNESS</sup>. * **Verifier<sup>CHECKSUM-WITNESS</sup>**: n/a <br> Witnesses are trusted parties. Security is based on _strength in numbers_. |