Spending on national security and counter-terrorism is to rise by £1bn over the coming three years, the chancellor has announced.
Extra funding follows reforms to counter-terrorism planning
Alastair Darling pledged £3.5bn a year by 2010-11 in the country's first single security budget.
He said there would be £700m extra for the Home Office's work and a small increase for the Ministry of Justice.
Prime Minister Gordon Brown announced reforms to counter-terrorism and national security planning in July.
Shortly after taking office, he said the government would set an annual single security budget and publish a national security strategy.
The reforms were part of a package of measures to increase funding on counter-terrorism and security two years on from the 2005 suicide bombings in London.
In his first Comprehensive Spending Review, Mr Darling told MPs that the single security budget would reach £3.5bn by 2010-11, covering the police, security services, Home Office and other relevant government work.
The chancellor said that annual total was £1bn more than the current annual spending and a tripling of funding since the 9/11 attacks on the United States.
Ministers say some £100m of the single security budget will be dedicated to schemes to prevent people being drawn into violent extremism.
Home Secretary Jacqui Smith: More focus on terrorism
As expected, a further £61m has been earmarked for cultural programmes to break down barriers, including the BBC's plans for foreign language satellite television services beaming into the Middle East.
The budgets for the UK's intelligence services would continue to rise in real terms by 9.6% a year, said Mr Darling.
The government has also set priority targets for combating terrorism, although these will remain classified. Home Secretary Jacqui Smith said: "I welcome this significant new investment for security and counter-terrorism matters.
"The funding will improve our ability to tackle the immediate threat to the UK, strengthen our security measures to protect the UK from attack, allow the development of new technology, which will enable us to keep ahead of the terrorists, and put in place longer-term programmes to counter radicalisation."
In the wake of the 9/11 attacks the government began raising national security spending, taking it to approximately £3bn by this year.
HOME OFFICE EXTRA CASH
Source: Comprehensive Spending Review
Shortly after becoming prime minister, Mr Brown said there would be a new Office for Security and Counter-Terrorism co-ordinating efforts across government and the various security agencies.
The government had already announced it was splitting the Home Office to make it more closely focused on crime, terrorism and immigration. Its other functions were passed to a new Ministry of Justice and other powers to the Department for Communities.
The Metropolitan Police has reformed its investigative teams by launching Counter Terrorism Command, a unit that is now being supported by new regional Counter-Terrorism Units in key cities around the country.
Behind these sit new regional MI5 units, the first time that the security service has had a permanent and substantial regional presence outside of London and Northern Ireland.
The third prong of the government's strategy is a focus on preventing extremism, although ministers have been accused in the two years since the London suicide bombings of not acting quickly enough on radicalisation.
The Department for Communities has now established a team dedicated ton preventing extremism.
The Comprehensive Spending Review's detailed figures show Home Office-specific funding will rise by about £220m a year over three years, equivalent to a 1.1% growth in its budget.