Design stage: there is no released app yet. This site separates what exists in the repository from what is planned. See status

Hardware, platform and safety / Security and privacy

Where does “Signed files” fit in Simca, with a focus on key rotation?

Not decided C0184

Interchange documents are planned as signed files so they can be verified offline. Signature scheme is not decided. Plan for: key rotation; offline verification; revocation. It is not decided.

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The tag above says how real the answer is. Answers describe the plan in the repository and design documents. No app is released. Where an answer touches tax or law, treat it as a theme to verify with a qualified local adviser.

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