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Internet of Things (IoT) technology is anticipated to pave the way for groundbreaking applications in a number of areas of current healthcare systems. Given the significant number of connected medical devices, the vital data generated by the patient is under several security threats. Selective Forwarding (SF) and Wormhole (WH) attacks are two critical threats that cause information deficit in the network. The SF attack drops critical data packets at compromised nodes while the WH attack creates fallacious routing tables due to the introduction of malicious routes in the network. In this paper, we focus on the security aspects of Healthcare-IoT and review the proposed counter-measures against the SF and WH attacks. We weigh the recently postulated counter-measures based on their significance and identify their limitations. Additionally, we propose a blockchain-based cryptographic framework for mitigating SF and …