We propose an authentication-encryption fusion scheme that combines physical layer security with post-quantum cryptography to address the security challenges of 6G wireless communication networks. To address the lack of quantum-resistant capability and data confidentiality protection in existing physical layer authentication, we firstly design a collision-resistant hash function based on the module lattice, which can be adapted to different security levels; secondly, we apply the hash function to the GCM-SIV mode to develop an authentication cryptographic algorithm variant with quantum-resistant capability; and finally, apply the proposed authentication cryptographic algorithm to an existing physical layer authentication framework to build an integration. The proposed authentication encryption algorithms, LGS are applied to the existing physical layer authentication framework to build an integrated solution that achieves the unity of message authenticity and integrity verification and data confidentiality protection. The experiment shows LGS costs 2.05 ms in total with 128-bit security strength, which has significant advantages and application potential.