LLMs and Text-in-Text Steganography: Limits and Risks
📄 Schneier surveys simple steganographic tricks—white-on-white text, phonological misspellings, and special fonts—and finds them increasingly ineffective. He notes that even modest 4-billion-parameter models can decode phonologically altered sentences, undermining tokenization-based obfuscation strategies. The post revisits TEMPEST/EmSec concerns, observing that inexpensive software-defined radios and toolkits like GNU Radio have expanded adversary capabilities beyond older Soft Tempest countermeasures. Schneier highlights demos such as Tempest for Eliza and TempestSDR as practical illustrations of ongoing risks.
