Multiparty Simultaneous Quantum Identity Authentication (MSQIA) is a form of quantum authentication protocol in which a verifier can simultaneously authenticate all users. Yang et al. previously proposed the MSQIA protocol, but in that protocol the user's key is revealed by the fake signal attack. This paper proposes a new MSQIA protocol that is secure against fake signal attacks. It also demonstrates that this scheme is secure against several well-known attacks on MSQIA. This protocol can be efficiently used for MSQIA in a network and is feasible with current technology, like the protocol of Yang et al.