In theory, it is indeed possible to hide threatening information in digital communications by writing specific code. This technique is called steganography. Steganography is a technique of hiding information in a seemingly harmless carrier. Some common steganography methods include： 1. Modify the least significant bit (LSB) in the image file to embed information 2. Use special algorithms to hide data in audio or video files 3. Use unused fields or header information in the network protocol 4. Embed hidden information in ordinary text through special encoding methods However, it should be emphasized that it is illegal to use such technologies to transmit threatening, illegal or harmful content. Modern cybersecurity systems and law enforcement agencies also have a variety of advanced tools and technologies to detect such hidden communications. I cannot provide specific guidance on how to implement this kind of steganography technique for malicious purposes. If you have an academic or security research interest in steganography, I suggest exploring this field within a legal and ethical framework.