a: The ability to share Resource Groups is the reason that every Resource Group needs its own key, and every account needs a public/private key-pair to securely share said key. Here’s an example involving two users, Jane and Bob. For Jane to share a Resource Group with Bob, she must encrypt the Resource Group’s key with Bob’s public key and store it on the server (M_Link). Now, Bob can use his account’s private key to decrypt the Resource Group’s key and gain access to the data. This is a classic example of the Diffie-Hellman key exchange being put to good use.
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