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2.2. New relay cell payload
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When encrypting a cell for a hop that was created using one of these
circuits, clients and relays encrypt them using the AEZ algorithm
with the following parameters:
Let Chain denote chain_val_forward if this is a forward cell
or chain_forward_backward otherwise.
chain_val_backward?
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3.3. Why _not_ AEZ?
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THIRD, it's really horrible to try to do it in hardware.
This may be considered an advantage against an adversary with the resources to employ custom hardware to attempt to break AEZ-based encryption.
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4.3. A forward-secure variant.
How is this different to what you've specified in the main body of the proposal?
We might want the property that after every cell, we can forget
some secret that would enable us to decrypt that cell if we saw
it again.
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