Multiprotocol Label Switching (MPLS) and Generalized MPLS (GMPLS) Traffic Engineering (TE) Label Switched Paths (LSPs) may be computed by Path Computation Elements (PCEs). Where the TE LSP crosses multiple domains@ such as Autonomous Systems (ASes)@ the path may be computed by multiple PCEs that cooperate@ with each responsible for computing a segment of the path. However@ in some cases (e.g.@ when ASes are administered by separate Service Providers)@ it would break confidentiality rules for a PCE to supply a path segment to a PCE in another domain@ thus disclosing AS-internal topology information. This issue may be circumvented by returning a loose hop and by invoking a new path computation from the domain boundary Label Switching Router (LSR) during TE LSP setup as the signaling message enters the second domain@ but this technique has several issues including the problem of maintaining path diversity. This document defines a mechanism to hide the contents of a segment of a path@ called the Confidential Path Segment (CPS). The CPS may be replaced by a path-key that can be conveyed in the PCE Communication Protocol (PCEP) and signaled within in a Resource Reservation Protocol TE (RSVP-TE) explicit route object.