A snailmail letter can be sent “care of” someone: Alice sends a letter addressed to
Bob
c/o Caroline
[Caroline’s address]
Caroline gets the letter delivered to her and passes it on to Bob.
Could I permit some of my contacts to send messages c/o me? I would not be able to decrypt anything except the destination address and perhaps a requested delay; I’d just unwrap and forward the message automatically, onion-style.
This would allow two people to talk to one another without disclosing the fact that they are talking to one another, even if they are both forced to use a relay hosted by an adversary.
DC is aimed at trusted friends and family, so this seems to fit.