Blair is back to give Ed a headache

Not to put too fine a point on things, Tony is pissed off.

Tony Blair is back. The Middle East is aflame, the coalition floundering. Whatever your view of Labour's polarising former premier, he hasn't lost his sense of political timing.

"Blair the 'back-seat driver' tells Ed Miliband to up his game", reported the Sunday Telegraph. "The former prime minister has told Mr Miliband he has risked cheapening his role by intervening too often on too many relatively trivial issues."

Miliband was no doubt delighted with the advice. As Nick Clegg grapples the Monster Raving Loony Party for political survival – and David Cameron strides on to the international stage with all the gravitas and judgement of Dr Strangelove – Labour's current leader needs his predecessor popping up like he needs a hole in the head.

Attempts to brush off Sunday's briefing as part of a "regular" series of conversations between the two men have fooled no one. Blair is, not to put too fine a point on things, pissed off. He's angry at Miliband's apparent junking of New Labour. He's even angrier at attempts to tarnish his legacy with what he sees as misrepresentation of his efforts to bring Muammar al-Gaddafi into the international mainstream.

And he's most angry at what he regards as an effort to use the "Arab spring" as a further stick to beat him, his Iraq policy and his broader policy of progressive interventionism.

Ed Miliband's team believe this anger is now being channelled into a co-ordinated Blairite fightback. Jack Straw, Peter Mandelson, David Miliband and Jim Murphy have all made recent high-profile interventions defending Blair and his foreign affairs record and philosophy. "We know what's going on," said one Miliband supporter. "We're not stupid."

Claims in the Telegraph article that Blair was responsible for recent improvements in Milband's performance and standing have been met with bewilderment. "It would be ludicrous to pretend this is all down to Tony – the unpopularity of the government's spending cuts obviously plays a major role – but Ed is always happy to listen to his advice," said a leadership source.

Those close to the Blairite camp see things somewhat differently. According to supporters of the former leader, Ed Miliband is becoming increasingly nervous at his failure to build a proper support base within the party. "Last time Ed spoke to Tony he wanted his help and advice in shoring up his position," one said. "It's taking much longer to bring people round than Ed anticipated."

There are also frustrations among a number of Blairite supporters with what they see as Miliband's failure to build on his recent tactical success. "The coalition keeps screwing up, and we keep hitting them. But we're not building an alternative case for why people should back Labour. Our only argument is 'at least we're not the Tories or the Lib Dems'."

Yet differing emphases over the response to the tumultuous events in the Middle East are creating the most significant tensions. Miliband's team fervently believes there is no appetite among the voters for further international adventurism. "Even if we wanted to get involved in Libya, the public won't wear it," said one source.

This sits in stark contrast to the interventionist instincts of some members of his own shadow cabinet. At a speech to the Royal United Services Institute in London on Thursday, Jim Murphy issued a veritable call to arms. "Britain can and should play an important part in shaping world events and trends, with our armed forces its heart," he urged.

That Britain should have responsibilities beyond her borders, he said, was "not, as some would have it, ideological, but, as we have seen over the last few days, a necessary response to the world in which we live. This is a challenge for the Labour Party. Opposition is about proving your preparedness to engage with the issues you would have to in government if it is to be responsible and ultimately electorally credible."

Compare that to an article Miliband wrote for the Observer four days earlier and the difference in emphasis is striking. He wrote:

The neocons were wrong to think we could impose democracy at the point of a gun. In this new era, soft power will often be a better way to achieve hard results. That is why support for civil society, the promotion of national assets such as the British Council and the BBC World Service, is so important. Our template should be the EU's response to the democratic revolutions of 1989 which helped make change in eastern Europe irreversible, with economic aid, technical assistance and institution-building.

The crisis in the Middle East has forced Miliband to sit down at the chessboard of foreign policy rather earlier in his leadership than he would have liked. Because of that, he has yet to formulate a settled policy agenda.

But he does have one simple rule: avoid getting into the mess Blair got himself into.

It's not a foreign affairs credo the former leader and his supporters are likely to warm to.

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Can Trident be hacked?

A former defence secretary has warned that Trident is vulnerable to cyber attacks. Is it?

What if, in the event of a destructive nuclear war, the prime minister goes to press the red button and it just doesn't work? 

This was the question raised by Des Browne, a former defence secretary, in an interview witht the Guardian this week. His argument, based on a report from the defence science board of the US Department of Defense, is that the UK's Trident nuclear weapons could be vulnerable to cyberattacks, and therefore rendered useless if hacked. 

Browne called for an "end-to-end" assessment of the system's cybersecurity: 

 The government ... have an obligation to assure parliament that all of the systems of the nuclear deterrent have been assessed end-to-end against cyber attacks to understand possible weak spots and that those weak spots are protected against a high-tier cyber threat. If they are unable to do that then there is no guarantee that we will have a reliable deterrent or the prime minister will be able to use this system when he needs to reach for it.

Is he right? Should we really be worried about Trident's potential cyber weaknesses?

Tangled webs 

The first, crucial thing to note is that Trident is not connected to the "internet" we use every day. Sure, it's connected to the main Ministry of Defence network, but this operates totally independently of the network that you visit Facebook through. In cyber-security terms, this means the network is "air-gapped" - it's isolated from other systems that could be less secure. 

In our minds, Trident is old and needs replacing (the submarines began patrolling in the 1990s), but any strike would be ordered and co-ordinated from Northwood, a military bunker 100m underground which would use the same modern networks as the rest of the MoD. Trident is basically as secure as the rest of the MoD. 

What the MoD said

I asked the Ministry of Defence for a statement on Trident's security, and while it obviously can't offer much information about how it all actually works, a spokesperson confirmed that the system is air-gapped and added: 

We wouldn't comment on the detail of our security arrangements for the nuclear deterrent but we can and do safeguard it from all threats including cyber.

What security experts said

Security experts agree that an air-gapped system tends to be more secure than one connected to the internet. Sean Sullivan, a security adviser at F-secure, told Infosecurity magazine that while some hackers have been able to "jump" air-gaps using code, this would cause "interference" at most and a major attack of this kind is still "a long way off". 

Franklin Miller, a former White House defence policy offer, told the Guardian that the original report cited by Browne was actually formulated in response to suggestions that some US defence networks should be connected to the internet. In that case, it actually represents an argument in favour of the type of air-gapped system used by the MoD. 

So... can it be hacked?

The answer is really that any system could be hacked, but a specialised, independent defence network is very, very unlikely to be. If a successful hack did happen, it would likely affect all aspects of defence, not just Trident. That doesn't mean that every effort shouldn't be made to make sure the MoD is using the most secure system possible, but it also means that scaremongering in the context of other, unrelated cybersecurity scares is a little unjustified. 

Barbara Speed is a technology and digital culture writer at the New Statesman and a staff writer at CityMetric.