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GpgFrontend
A free, open-source, robust yet user-friendly, compact and cross-platform tool for OpenPGP encryption. It stands out as an exceptional GUI frontend for the modern GnuPG (gpg).
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
No, however, here is an E2EE specification proposal for Mastadon, https://github.com/soatok/mastodon-e2ee-specification
Use this https://github.com/saturneric/GpgFrontend on top of it, then they need a $10 wrench to get the private key. This way you and only you have the private key.
Mastodon's closer to how email servers communicate with eachother (more so than NNTP, Mastodon is peer-by-default once it becomes aware of a server, which is far closer to email behavior).