The security of ChaCha stream cipher family design from Salsa stream cipher design. The ChaCha design also ovolo round process. ChaCha20 has many versions such as ChaCha20, ChaCha2, ChaCha8, ChaCha7, ChaChca4 are analogue modifications of the round ciphers. These versions are compared with itself, and show the best encryption speed is ChaCha4. This ChaCha4 main drawback is only encryption speed and tiny bit data security. In this work to overcome this drawback and proposed new security algorithm. The proposed algorithm has two processes. The first process is analyze the possible prime number in the given matrix. The second process is apply the possible prime numbers in quadratic equations in the given matrix. Finally, the proposed algorithm has compared with ChaCha algorithm. © 2021 Elsevier B.V., All rights reserved.