A Comparative Experiment of Document Security Level on Parallel Encryption With Digit Arithmetic of Covertext and Parallel Encryption using Covertext

Documents for some entities contain important information. Cryptography and steganography are a mechanism that is often used to maintain confidentiality. Parallel Encryption With Digit Arithmetic of Covertext (PDAC) and Parallel Encryption using Covertext (PECT) are two encryption models for securing text-based documents. Both have similarities and differences in the mechanism. This research is experimenting with the models to see which is better for securing documents. This study also aims to find the important factors inside PDAC and PECT. Parameters used to compare are entropy and file size. As a result, it is found that the PDAC and PECT ciphertexts have the same size, but PDAC has a higher entropy value than PECT. This experiment also found factors that affect the level of security.