Excerpts:

Computer tech expert William Entriken has created a C library that can make a computer emit radio waves even if the device doesn't include any radio transmission hardware.

His program, called System Bus Radio, is written in C and relies on code that makes the computer's CPU emit electromagnetic radiation at certain frequencies.

The radiation is strong enough to escape the computer's shielding, and with the proper timing at which data is processed in the CPU, it can be forged into radio waves that carry off information away from the target's computer.

During tests, Mr. Entriken says he managed to transmit a version of the "Mary Had a Little Lamb" song over a distance of up to two meters and one meter if a drywall separated the computer and the receiving antenna.

You can get System Bus Radio from GitHub, test it on your own hardware, and add your results to Mr. Entriken's findings.

Worth reminding that this escape method was invented by a human-level intelligence. A Bayesian superintelligence may be able to devise much more cunning methods.