Patent attributes
A system and methods are provided for verifying proof of transit of network traffic through a plurality of network nodes in a network. In one embodiment, each network node reads a first value and a second value from in-band metadata of packet, and generates, using a cryptographic key that is unique to each respective network node, an encryption result based on the first value. An updated second value is generated based on the second value read from the packet and the encryption result. Each network node writes the updated second value to the in-band metadata of the packet, and forwards the packet in the network. In another embodiment, a secret sharing scheme is employed by each network node computes a portion of verification information using a unique share of a secret and based on the packet specific information.
