Hong Kong's security chief has announced new rules allowing authorities to demand external technicians decrypt devices in national security investigations, with punishments for those providing incorrect passwords.

Hong Kong authorities will be able to demand external technicians or any “specified person” decrypt electronic devices during national security investigations and may punish suspects who provide wrong passwords or falsely claim to have forgotten them, the security chief has told lawmakers. Secretary for Security Chris Tang Ping-keung stressed on Tuesday that recent amendments to the national security law’s implementation rules did not create new law enforcement powers. “These amendments have...