So I'm not claiming to have studied IBE in depth, but.... While thinking about PGP and subkeys today, I started wondering about an IBE-like or BIP-32-like system, where if you have a public key, you can generate a new public key for a 'tag', and given a private key and a tag you can generate the tag's private key.
This would let you publish a master key (like in PGP) and then people who want to communicate with you over, say, 'OTR' or 'ZRTP' can generate a service subkey for you automatically, and you can generate the corresponding private service subkey, even after they've generated a public key. You'd have to do an ugly dance about revoked service keys, like publish a linked list with your master key 'OTR' -> 'OTR_2'. -tom PS: This was also in no way influenced by my subkey-expiration-without-noticing a week ago ;) _______________________________________________ Messaging mailing list [email protected] https://moderncrypto.org/mailman/listinfo/messaging
