New methods for blockchain technology and decentralized infrastructures emerged using Byzantine Fault-Tolerant (BFT) State Machine Replication (SMR), a reliable approach for creating trustworthy services. However, BFT SMR lacks secrecy protection, though it ensures integrity and availability even in the presence of live adversaries. Earlier attempts to address this issue integrated secret sharing into the consensus-based framework of BFT SMR but fell short in terms of replica recovery, group reconfiguration, and high-performance handling of numerous secrets. To fill this gap, we introduce NAGA, a protocol stack for Dynamic Proactive Secret Sharing that facilitates real-world BFT SMR systems with Multi-party Computation (MPC)-based secrecy implementation.