Magsafe actually isn't stupid - there's bidirectional communication with the laptop over the data pin in the middle of the connector, using the 1-Wire protocol.

Magsafe actually isn't stupid - there's bidirectional communication with the laptop over the data pin in the middle of the connector, using the 1-Wire protocol. The protocol is probably simple enough to have no security issues, but now I wonder if a malicious connector could carry out an attack (buffer overflow, bad data, etc). Some security engineer might want to investigate this...