A look at the global cyber-security challenges faced around the world.
Britain’s GCHQ intelligency agency is preparing to come out of the shadows to combat current cyber challenges.
Faced with a list of last minute problems, ministers and organisers insist the Olympic security situation is under control.
The three heads of the UK's Intelligence Agencies will make history this afternoon when they appear in public together for the first time to talk about their work.
GCHQ director Sir Iain Lobban will join Andrew Parker, the director general of the Security Service and Sir John Sawers, chief of the Secret Intelligence Service at the Intelligence and Security Committee's first open evidence session.
The televised proceedings will be subjected to a two-minute delay to prevent anything that might endanger national security or the safety of those working for the agencies being broadcast.
A criminal investigation has been launched into a contract between security firm G4S and the Government for tagging criminals.
An inquiry has been opened by the Serious Fraud Office after it emerged G4S, along with Serco, had charged the Ministry of Justice for monitoring offenders who were dead, back in prison, had their tags removed, left the country or never been tagged in the first place.
An audit by accountancy firm PricewaterhouseCoopers, launched in May, alleged that overcharging began at least as far back as the start of the current contracts in 2005.
The Government reported G4S in July when the FTSE 100 firm refused to take part in an additional audit to rule out any dishonesty.
The United Nations is to contact the United States about reports that America's National Security Agency hacked the world body's internal communications, according to the Associated Press agency.
The UN emphasised that international treaties protected its offices and all diplomatic missions from interference, spying and eavesdropping.
Its spokesman Farhan Haq said the UN would "reach out" to US officials about the reports of eavesdropping, as it has in the past when such allegations have been raised.
Former Labour Home Secretary Jack Straw criticised Deputy Prime Minister Nick Clegg's stance against increasing internet monitoring powers for security services.
He told BBC2's Newsnight: "He needs to think about what is more important: supporting Google and Amazon and these other American behemoths; or supporting security and reassurance for the British people."
Mr Clegg blocked the Communications Data Bill as he said it was "disproportionate" and in his view "unworkable".
There have been calls for the Communications Data Bill, dubbed the "snoopers charters" to be revived in the wake of the terror attack on Drummer Lee Rigby.
The bill was previously blocked from the Queen's Speech by the Deputy Prime Minister Nick Clegg who has said it had "proved to be either disproportionate in my view or not workable".
Four home secretaries are among senior politicians who have written a letter in The Times calling for security services to be given increased internet monitoring powers.
Labour's Jack Straw, David Blunkett and Alan Johnson, and Conservative Lord Baker signed the letter which says:
Coalition niceties and party politics must not get in the way of giving our security services the capabilities they need to stay one step ahead of those that seek to destroy our society.
When such a threat reveals itself, government has a duty to ensure they can do all they can to counter it.
Far from being a 'snoopers' charter', as critics allege, the draft bill, seeks to match our crime fighting capabilities to the advances in technologies.
The proposed Communications Data Bill does not want access to the content of our communications but does want to ensure that enough data is available in the aftermath of an attack to help investigators establish 'who, where and when' were involved in planning or supporting it."
Tory former defence secretary Lord King, and Liberal Democrat Lord Carlile, the former independent reviewer of UK anti-terror laws, also added their signatures.
Senior Labour and Conservative figures have joined forces to demand the security services be granted extensive new internet monitoring powers.
In a letter to The Times, the politicians - who include four former home secretaries - warned: "Coalition niceties must not get in the way of giving our security services the capabilities they need to stay one step ahead of those that seek to destroy our society".
It comes after Deputy Prime Minister Nick Clegg reaffirmed his objection to the Communications Data Bill, which he blocked from the Queen's Speech, saying it had "proved to be either disproportionate in my view or not workable".
Twitter's director of information security, Bob Lord said the hacking attack on the social networking site "was not the work of amateurs".
This attack was not the work of amateurs, and we do not believe it was an isolated incident. The attackers were extremely sophisticated, and we believe other companies and organizations have also been recently similarly attacked. For that reason we felt that it was important to publicize this attack while we still gather information, and we are helping government and federal law enforcement in their effort to find and prosecute these attackers to make the Internet safer for all users.