The US National Security Agency is trying to develop a computer that could ultimately break most encryption programs, whether they are used to protect other nations' spying programs or consumers' bank accounts, The Washington Post reported on Thursday.
The report, which the newspaper said was based on documents leaked by former NSA contractor Edward Snowden, comes amid continuing controversy over the spy agency's programme to collect the phone records Internet communications of private citizens.
In its report on Thursday, The Washington Post said that the NSA is trying to develop a so-called "quantum computer" that could be used to break encryption codes used to cloak sensitive information.
Such a computer, which would be able to perform several calculations at once instead of in a single stream, could take years to develop, the newspaper said. In addition to being able to break through the cloaks meant to protect private data, such a computer would have implications for such fields as medicine, the newspaper reported.
The research is part of a US$79.7 million (S$100.9 million) research programme called "Penetrating Hard Targets," the newspaper said. Other, non-governmental researchers are also trying to develop quantum computers, and it is not clear whether the NSA programme lags the private efforts or is ahead of them.
Snowden, living in Russia with temporary asylum, last year leaked documents he collected while working for the NSA. The United States has charged him with espionage, and more charges could follow.
His disclosures have sparked a debate over how much leeway to give the US government in gathering information to protect Americans from terrorism, and have prompted numerous lawsuits.
Last week, a federal judge ruled that the NSA's collection of phone call records is lawful, while another judge earlier in December questioned the programme's constitutionality. The issue is now more likely to move before the US Supreme Court.
On Thursday, the editorial board of the New York Times said that the US government should grant Snowden clemency or a plea bargain, given the public value of revelations over the National Security Agency's vast spying programs.