This document proposes a secure intrusion detection system called EAACK for mobile ad hoc networks (MANETs). It discusses problems with existing IDS approaches for MANETs like Watchdog and TWOACK. The EAACK scheme aims to solve these problems by utilizing three parts: ACK, S-ACK and MRA. ACK uses end-to-end acknowledgment, S-ACK is an improved version of TWOACK, and MRA is used to resolve weaknesses in detecting misbehaving nodes. The objectives of this research are to study existing IDS schemes for MANETs, implement an IDS using the EAACK scheme, utilize digital signatures, and evaluate EAACK's performance compared to other approaches.