Secure computation of multiparty protocol (MPP) is being widely used to address privacy issues in various technologies, such as cryptocurrencies, blockchain, and many more. The security of MPP is computed in various steps, mainly via secret sharing of keys, encryption/decryption of messages, and signature generation. However, literature suggests the secure computation of multiparty is arduous in the presence of adversarial nature of parties. In this paper, we propose a notion for achieving ECDSA in a multiparty protocol using an Authentication server \(A_{t}\) . We demonstrate this using four steps: 1. proposal of multiparty (five) protocol (5PP) in which there are parties with adversarial natures. 2. setup of 5PP with \(A_{t}\) that ensures the mutual identification of parties. 3. Encryption of messages in the proposed 5PP. 4. ECDSA signature generation between the parties in the aforementioned setup. We ensure security in all the steps mainly by using modified Paillier cryptosystem and homomorphic encryption.