<![CDATA[In today’s era of technological advancement, safeguarding personal information is very important to prevent misuse by unauthorized parties. Therefore, this study contributes to the field of information security by presenting a cryptographic-steganography modification scheme that can improve message security while maintaining image quality by combining multi-stratified encryption such as Caesar, Vigenère, and Atbash in ASCII 256 representations and inserted using the 1-bit Least Significant Bit (LSB) method. This research aims to improve the security of messages by increasing the randomness of the generated ciphertext while maintaining the overall visual integrityof the image. The methods used includmulti-layer encryption, embedding with the smallest bit modifications, as well as quality testing through histogram analysis, mean RGB, MSE, PSNR, and entropy values. The experimental findings indicated that any variation separating the original image from the stego version was nearly undetectable, both through visual inspection and statistical evaluation. With a very small MSE value, the PSNR reaches 98 dB, and a histogram that shows similarity in each color channel. Overall, the study showed that the combination of classical encryption and 1-bit LSB insertion was highly effective in maintaining the confidentiality, image quality, and concealability of messages. In practical terms, this method has the potential to be applied to digital communication security systems and image-based transmission of confidential data. However, the study still has limitations on specific test scenarios and has not evaluated its resistance to various advanced steganalysis attacks.]]>
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