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BOLT04: Add rationale for constant error decryption. #1154

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BOLT04: Add rationale for constant error decryption. #1154

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BOLT04: Add rationale for constant error decryption.
ziggie1984 Apr 16, 2024
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fixup! BOLT04: Add rationale for constant error decryption.
ziggie1984 Apr 17, 2024
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10 changes: 9 additions & 1 deletion 04-onion-routing.md
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Expand Up @@ -1057,9 +1057,17 @@ The _erring node_:
The _origin node_:
- once the return message has been decrypted:
- SHOULD store a copy of the message.
- SHOULD continue decrypting, until the loop has been repeated 20 times.
- SHOULD continue decrypting, until the loop has been repeated 27 times
(maximum route length of tlv payload type).
- SHOULD use constant `ammag` and `um` keys to obfuscate the route length.

### Rationale

The requirements for the _origin node_ should help hide the payment sender.
By continuing decrypting 27 times (dummy decryption cycles after the error is found)
the erroring node cannot learn its relative position in the route by performing
a timing analysis if the sender were to retry the same route multiple times.

## Failure Messages

The failure message encapsulated in `failuremsg` has an identical format as
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