Recent work shows that it is possible to use acoustic data to break public key encryption systems. Essentially, if one can send specific encrypted plaintext then the resulting sounds the CPU makes when decrypting can reveal information about the key. The attack was successfully demonstrated to work on 4096 bit RSA encryption. While some versions of the attack require high quality microphones, some versions apparently were successful just using mobile phones.

Aside from the general interest issues, this is one more example of how a supposedly boxed AI might be able to send out detailed information to the outside. In particular, one can send surprisingly high bandwith even accidentally through acoustic channels.