Definitions for "Anti-Spoofing"
the denial of access of the P code to civilian users
The process of encrypting P-Code information so that it cannot be replicated by enemy forces. After encryption, P-Code is referred to as Y-Code. (See Y-Code and Spoofing.)
Encryption of the P-code to protect the P-signals from being "spoofed" through the transmission of false GPS signals by an adversary.