Covert Communication Techniques: Masking and Misdirection

In the realm of cybersecurity, a new threat has emerged, one that is as subtle as it is dangerous. This threat is known as digital steganography, a practice that originates from ancient times and has evolved with the advent of technology.

Steganography, derived from the Greek words "steagnós" and "gráphein," meaning "covered writing," is the art of hiding information on an inconspicuous medium. In the digital age, this means hiding data within digital files such as images or audio files.

One of the earliest methods of steganography involved shaving slaves' heads to tattoo information on their scalps. Today, the methods may seem less brutal, but no less cunning. Information can be hidden in digital files by slightly altering a binary bit in one of the RGB basic colours, resulting in a colour change that is not perceptible to the human eye.

Digital image and audio files, due to their large file size and carrier data, are particularly suitable for hiding data as payload. PNG image files, with their lossless compression, are more suitable than JPG files for this purpose. Up to 20% of the file size in PNG images can be inconspicuously accommodated in the form of binary data.

Modern versions of steganography include the Machine Identification Code (MIC), also known as "yellow dots," printed by modern color laser printers. These dots contain information such as the serial number, date, and time of the printout.

Cybercriminals now use steganography to unobtrusively spread malware in files such as attachments in emails, memes on the internet and social media, and useful apps. The action of enlarging an image in an email or on a website may lead to the start of malware. Even zipped or password-protected files can be analyzed and disinfected.

However, detecting steganography-hidden malware is nearly impossible for anti-virus software, especially with additional data encryption. This makes it a growing threat to IT security.

To combat this threat, file disinfection can help in IT security by disinfecting risky file types, converting them into secure formats, and safely converting files with integrated objects without affecting their functionality. Unfortunately, the specific company or person that develops and produces the file-disinfection process is not identified in the provided search results.

A special form of linguistic steganography is the semagram, where information is hidden in harmless messages, images, or audio files. In a text, the "characteristic letters or words" can be inconspicuously marked in a semagram by printing them slightly larger or in italics. The minimal changes in semagrams are not detectable by human senses or are perceived as unimportant noise.

As technology continues to evolve, so too will the methods of steganography. It is crucial that we stay vigilant and continue to develop ways to detect and combat this hidden threat.