Kusuma, E.P., Naysilla, A.N. and Yulianto, B.D. 2025. SmartNotes Encrypted with Hybrid Cryptography Combining Rivest Cipher 4 and XChaCha20. JEECS (Journal of Electrical Engineering and Computer Sciences). 10, 2 (Dec. 2025), 142–151. DOI:https://doi.org/10.54732/jeecs.v10i2.5.