I made a #diy #electronics standalone #cryptography #cybersecurity device the ParanoiaBox. It is an experiment with a minimal attack surface as it is a #microcontroller, keyboard, television, with no operating system intended for #encryption and decryption of files between an insecure air-gapped computer and the internet. It uses AES256 and ECDH EC25519 public-key encryption to enable #secret #communications. Files are encrypted into text so they may be easily E-mailed or posted on forums.