In this task, you are given an article. Your task is to summarize the article in a sentence.

Q: They call themselves the Impact Team and seem to have formed solely to carry out the attack on the infidelity website. There is no evidence of the group stealing data elsewhere before it announced itself with the Ashley Madison attack on 15 July.
Comments made by Noel Biderman, chief executive of Avid Life Media, which owns Ashley Madison, soon after the hack became public suggested it knew the identity of at least one of the people involved.
"It was definitely a person here that was not an employee but certainly had touched our technical services," he told security blogger Brian Krebs.
Since then, little new information has been made public about the hack, leading some to assume that the information Avid had about a suspect would soon lead to an arrest.
But it did not, and now gigabytes of information have been released and no-one is any the wiser about who the hackers are, where they are located and why they attacked the site.
The group is technically pretty competent, according to independent security researcher The Grugq, who asked to remain anonymous.
"Ashley Madison seems to have been better protected than some of the other places that have been hit recently, so maybe the crew had a stronger skill set than normal," he told the BBC.
They have also shown that they are adept when it comes to sharing what they stole, said forensic security specialist Erik Cabetas in a detailed analysis of the data.
The data was leaked first via the Tor network because it is good at obscuring the location and identity of anyone using it. However, Mr Cabetas said the group had taken extra steps to ensure their dark web identities were not matched with their real-life identities.
The Impact Team dumped the data via a server that only gave out basic web and text data - leaving little forensic information to go on. In addition, the data files seem to have been pruned of extraneous information that could give a clue about who took them and how the hack was carried out.
The only potential lead that any investigator has is in the unique encryption key used to digitally sign the dumped files. Mr Cabetas said this was being employed to confirm the files were authentic and not fakes. But he said it could also be used to identify someone if they were ever caught.
But he warned that using Tor was not foolproof. High-profile hackers, including Ross Ulbricht, of Silk Road, have been caught because they inadvertently left identifiable information on Tor sites.
The Grugq has also warned about the dangers of neglecting operational security (known as opsec) and how extreme vigilance was needed to ensure no incriminating traces were left behind.
"Most opsec mistakes that hackers make are made early in their career," he said. "If they keep at it without changing their identifiers and handles (something that is harder for cybercriminals who need to maintain their reputation), then finding their mistakes is usually a matter of finding their earliest errors."
"I suspect they have a good chance of getting away because they haven't linked to any other identifiers. They've used Tor, and they've kept themselves pretty clean," he said. "There doesn't seem to be anything in their dumps or in their missives that would expose them."
The Grugq said it would need forensic data recovered from Ashley Madison around the time of the attack to track them down. But he said that if the attackers were skilled they might not have left much behind.
"If they go dark and never do anything again (related to the identities used for AM) then they will likely never be caught," he said.
Mr Cabetas agreed and said they would probably be unearthed only if they spilled information to someone outside the group.
"Nobody keeps something like this a secret. If the attackers tell anybody, they're likely going to get caught," he wrote.

A: A lot of data has been released about Ashley Madison but some facts of the breach of the dating website's database remain stubbornly elusive, not least who are the hackers behind the attack?
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Q: The group, Economists for Brexit, argue that leaving the EU would boost the UK economy by 4% in 10 years.
Brexit would put the UK outside the EU's customs union, which puts tariffs on imported goods.
The report claims that by being free of those constraints, prices in the UK would fall by 8%.
The EU referendum: All you need to know
The group proposes a World Trade Organization (WTO) agreement with the EU, similar to that enjoyed by the US and China.
The report's authors include Professor Patrick Minford, a former adviser to Baroness Margaret Thatcher, and Gerard Lyons, a former chief economist at Standard Chartered Bank and now an adviser to the London Mayor, Boris Johnson, who is campaigning for Britain to leave the EU.
The economic arguments have so far been tilted towards the Remain camp with the International Monetary Fund (IMF) and The Organisation for Economic Co-operation and Development (OECD) warning against leaving.
The OECD said leaving the EU would be the equivalent of imposing an additional "tax" of one month's income on UK workers.
A spokesperson for Britain Stronger In Europe said: "[UK] Treasury analysis shows that trading under WTO rules would be the worst possible alternative to EU membership, seeing households Â£5,200 worse off and a public spending black hole of Â£45bn."

A: A group of eight influential economists have thrown their support behind the Leave campaign in the UK's referendum on EU membership.
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Q: Workers who get in touch with internal investigators by then will be exempt from dismissal, according to a letter from VW brand chief Herbert Diess.
US regulators found VW put in software that turned on emissions controls when the car was being tested.
Some 11 million vehicles worldwide are affected by the scandal.
Mr Diess said the offer was being made in the interests of "full and swift clarification".
VW said it would not sack workers for what they might reveal, but they might be transferred to other duties.
"Employees covered by collective bargaining agreements who get in touch promptly, but no later than November 30, 2015... and... may rest assured that the company will waive consequences under labour law such as the termination of employment, and will not make any claim for damages," the letter said.
Last week, Europe's biggest carmaker also admitted to cheating on carbon dioxide emissions certifications.
VW has put aside â‚¬6.7bn (Â£4.7bn) to meet the cost of recalling the diesel vehicles worldwide that were fitted with so called "defeat devices" that circumvented tests for emissions of nitrogen oxides.
This offer shows the difficulty Volkswagen is facing.
It has appointed the American law firm Jones Day to carry out a thorough internal investigation into the emissions scandal. That is expected to take several months - yet the company needs to draw a line under the affair as quickly as possible, in order to focus on mending its battered reputation.
At the same time, the dirty laundry keeps on piling up. Last week's revelation of 'irregularities' in the measurement of CO2 emissions was a case in point.
Hence the amnesty for whistleblowers. Any concerted effort to deceive regulators would have needed input from engineers and technicians. They may have valuable knowledge to share, which could speed up the process dramatically.
The offer does not apply to managers. So if it turns out that deception was authorised at a high level, those responsible can still expect to be punished.

A:
German carmaker Volkswagen has set a 30 November deadline for staff with knowledge about its diesel emissions test cheating to come forward.
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