BIOS: Jurnal Informatika dan Sains

Implementation of the Discrete Cosine Transform (DCT) Steganography Method for Embedding Secret Messages in Image Media

Amsal Tampubolon — 2026-04-12

Steganography is a technique for hiding secret information within a cover medium so that the existence of the message is not easily detected. One of the steganography methods widely used in image media is the Discrete Cosine Transform (DCT), which works by transforming an image into the frequency domain before message embedding is performed. This study aims to implement a DCT-based steganography method for embedding secret messages into image media and to analyze the quality of the resulting stego images. The embedding process is carried out by modifying DCT coefficients in certain image blocks so that the resulting changes are not visually noticeable. The experimental results show that the DCT method is able to embed secret messages into images with a low level of distortion while maintaining visual quality. Thus, the DCT steganography method is proven to be effective as one of the image-based information security techniques.

Implementation of the Discrete Fourier Transform (DFT) Steganography Method for Embedding Secret Messages in Digital Image Media

Albert Julio Tampubolon — 2026-04-17

Steganography is a technique for hiding secret information within digital media such as images, audio, or video without raising suspicion. In this study, the Discrete Fourier Transform (DFT) method is applied to embed secret messages into digital images. DFT is a transformation that converts an image from the spatial domain into the frequency domain, allowing data to be embedded into specific frequency components that are not easily detected by the human eye. This research aims to implement and evaluate the DFT steganography method in terms of embedding capacity, stego image quality, and the security of the embedded message. The implementation process includes both embedding and extraction stages. Testing is conducted by measuring Peak Signal-to-Noise Ratio (PSNR) and Mean Square Error (MSE) to evaluate the quality of the stego image. The experimental results show that the DFT steganography method is able to successfully embed messages into digital images with an average PSNR value above 40 dB, indicating very good stego image quality that is not visually detectable. The method also demonstrates good resistance against basic steganalysis attacks. The implementation of the DFT-based steganography application was successfully developed with a user-friendly interface using Python.

Implementation of the Spread Spectrum Steganography Method for Embedding Secret Messages in Digital Image Media

Jonatan Carlos Rajagukguk — 2026-04-20

The development of information technology has increased the need for data security in the process of digital information exchange. In addition to cryptography, steganography has become an effective approach to maintaining data confidentiality by hiding messages within digital media without raising suspicion. One steganographic method with a high level of security is the Spread Spectrum method. This method works by spreading the message signal across a wide frequency spectrum so that it resembles noise and is difficult to detect. This study aims to examine and implement the Spread Spectrum steganography method in digital image media as a means of embedding secret messages. The method used includes the process of spreading the message using a pseudo-random code, embedding it into the image, and extracting the message on the receiver side. The results of the study indicate that the Spread Spectrum method is capable of hiding messages with a high level of imperceptibility and good robustness against disturbances. Therefore, this method is suitable for application in digital information security systems

Implementation of the Echo Hiding Steganography Method for Embedding Secret Messages in Audio Media

Kevin Marcho Nainggolan — 2026-04-21

The development of digital technology and audio communication has increased the intensity of information exchange through online media, but it also raises the risk of data leakage and misuse by unauthorized parties. Therefore, information security techniques are needed that not only protect the content of messages but also conceal the existence of the messages themselves. Steganography is an information security technique that embeds secret messages into a carrier medium without raising suspicion. Audio media is chosen because it has high tolerance for small changes in sound signals. This study discusses the implementation of the Echo Hiding steganography method for embedding secret messages in digital audio media. The Echo Hiding method works by adding an echo to the audio signal using specific delay time and amplitude parameters so that it does not significantly degrade audio quality. The research stages include audio data preparation, message embedding process, message extraction process, and evaluation of the stego audio quality. The expected results of this study show that the Echo Hiding method is capable of embedding and extracting messages accurately while maintaining audio quality. Thus, this method can be used as an alternative for audio-based steganographic information security.

Bit Plane Complexity Segmentation (BPCS)

Firamawati Hia — 2026-04-21

Bit Plane Complexity Segmentation (BPCS) is a steganographic method that utilizes the visual complexity characteristics of digital images to embed secret information. This method works by dividing an image into several bit-planes, then measuring the level of complexity of each bit-plane block. Blocks with high complexity are considered similar to noise, making them suitable as a medium for data embedding without causing significant visual changes to the original image. The main advantage of BPCS lies in its large data embedding capacity and high level of security, as the hidden information is difficult to detect through visual observation or simple analysis. Therefore, BPCS becomes an effective solution for securing digital data, particularly in applications such as copyright protection, confidential communication, and information security.