Your app picks up a bunch of feeds and composes them into a nice page for you, much like an RSS feed reader. The twist is that each feed is encrypted in a way that only you can decrypt, so the cryptography also gives strong identity guarantees, and allows for private messaging.

It's basically PGP + RSS, only mapped to a bunch of files of specific structure. Those could be RSS/ATOM feeds instead of JSON, to reuse an existing format. The reuse of the ideas is good, these ideas are time-proven.

As any PGP-lookalike, this thing has the key distribution problem, and won't scale to billions of users due to that. Key rotation and revocation is another problem. But for a small-scale network it should be fine, and can run on very tiny, very low-power devices, maybe even with intermittent connectivity.

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Retr0id 2 hours ago | parent [-]

> The twist is that each feed is encrypted in a way that only you can decrypt

Not true, the "content key" is common to all viewers of all posts, from a particular author. (hence the need to re-encrypt the world when you unfollow someone...)

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nine_k 2 hours ago | parent [-]

The content key is common, like the PGP session key is common. But to obtain the content key, you need to first decrypt it by your private key. The content key is encrypted by the public keys of every intended reader, so each can have a secure copy of the content key. Again, exactly like PGP works.

	▲	Retr0id an hour ago \| parent [-]
		A PGP session key does not span multiple messages, however