Hong Kong police can now demand phone or computer passwords from those who are suspected of breaching the wide-ranging National Security Law (NSL), BBC reported.
Those who refuse could face up to a year in jail and a fine of up to HK$100,000 ($12,700; £9,600), and individuals who provide "false or misleading information" could face up to three years in jail.
It comes as part of new amendments to a bylaw under the NSL that the government gazetted on Monday, according to BBC.