Content signed by each peer during DV learning. More...

Collaboration diagram for DvHopPS:

Data Fields
struct GNUNET_CRYPTO_EccSignaturePurpose	purpose
	Purpose is GNUNET_SIGNATURE_PURPOSE_TRANSPORT_DV_HOP. More...

struct GNUNET_PeerIdentity	pred
	Identity of the previous peer on the path. More...

struct GNUNET_PeerIdentity	succ
	Identity of the next peer on the path. More...

struct GNUNET_CRYPTO_ChallengeNonceP	challenge
	Challenge value used by the initiator to re-identify the path. More...

Detailed Description

Content signed by each peer during DV learning.

This assues the initiator of the DV learning operation that the hop from pred via the signing peer to succ actually exists. This makes it impossible for an adversary to supply the network with bogus routes.

The challenge is included to provide replay protection for the initiator. This way, the initiator knows that the hop existed after the original challenge was first transmitted, providing a freshness metric.

Peers other than the initiator that passively learn paths by observing these messages do NOT benefit from this. Here, an adversary may indeed replay old messages. Thus, passively learned paths should always be immediately marked as "potentially stale".

Definition at line 616 of file gnunet-service-transport.c.