Sulaiman, Oris Krianto, Khairuddin Nasution, and Satria Yudha Prayogi. 2019. “Enkripsi Surat Elektronik Menggunakan Metode XXTEA”. CESS (Journal of Computer Engineering, System and Science) 4 (1):99-104. https://doi.org/10.24114/cess.v4i1.12354.