The security services would be able to access Internet communication records, which show which online services were accessed by a suspect and when.
London:
Britain's government published proposals for new Internet spying laws today including allowing partial access to a suspect's Internet browsing history that were condemned by privacy campaigners.
Home Secretary Theresa May hailed the draft legislation as a "world-leading oversight regime", but a leading rights group described the proposals as a "breath-taking attack" on Britain's online security.
"This new legislation will underpin the work of law enforcement and the security and intelligence agencies for years to come. It is their licence to operate," Ms May told parliament.
The security services would be able to access Internet communication records, which show which online services were accessed by a suspect and when.
This would show that a messaging service such as Facebook or WhatsApp had been used, but not the content of messages or their recipient.
The bill also allows security officials to see which websites a suspect had accessed, but not which pages were viewed within those sites.
"Some have characterised this power as law enforcement having access to people's full web browsing histories. Let me be clear: this is simply wrong," Ms May said.
"An Internet connection record is a record of a communications service that a person has used, not a record of every webpage they have accessed."
The records would have to be held by service providers for 12 months.
The proposals would not force foreign-based companies such as Facebook and Google to meet "domestic retention obligations" for communications data.