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As we head in 2020 toward standards for encrypted data vaults (see overview github.com/WebOfTrustInfo…) I can't help but think of efforts in 1991 to add cryptography to the Xanadu Club system. I found some old Xanadu docs on this & scanned them for posterity: dropbox.com/s/qeyywxr9vk45…
In modern day cryptographic terms, each Xanadu document is like an encrypted git commit (a point in time of a collaborative document). The Read Club has the decryption key to read the data. The Write Club can collaborate to sign future revisions of document.
As I think about how the Club System might be implemented today, the Read Club would be architected something like Minilock, 45678.github.io/miniLock-file-… with its list of public key "permits" that can be unlocked using a Diffie-Hellman secret between keys to reveal the decryption key.
