Security researchers have discovered that Apple's iPhone keeps a record of where you go -- and saves every detail of it to a secret file on the device which is then copied to the owner's computer when the two are synchronised.

The file contains the latitude and longitude of the phone's recorded coordinates along with a timestamp, meaning that anyone who stole the phone or the computer could discover details about the owner's movements using a simple program.

For some phones, there could be almost a year's worth of data stored, as the recording of data seems to have started with Apple's iOS 4 update to the phone's operating system, released in June 2010.

Apple has made it possible for almost anybody -- a jealous spouse, a private detective -- with access to your phone or computer to get detailed information about where you've been, said Pete Warden, one of the researchers.

Although mobile networks already record phones' locations, it is only available to the police and other recognised organisations following a court order under the Regulation of Investigatory Power Act.

Warden and Allan have set up a web page which answers questions about the file, and created a simple downloadable application to let Apple users check for themselves what location data the phone is retaining.

The Guardian has confirmed that 3G-enabled devices including the iPad also retain the data and copy it to the owner's computer.

Two British tourists were refused entry into the USA after joking on Twitter that they were going to destroy America and dig up Marilyn Monroe. Leigh Van Bryan was handcuffed and kept under armed guard in a cell for 12 hours after landing in Los Angeles with pal Emily Bunting.

The Department of Homeland Security flagged him as a potential threat when he posted an excited tweet to his pals about his forthcoming trip to Hollywood which read:

Free this week, for quick gossip/prep before I go and destroy America?

Leigh was also quizzed about another tweet which quoted hit US comedy Family Guy which read:

3 weeks today, we're totally in LA pissed people off on Hollywood Blvd and diggin Marilyn Monroe up!

After making their way through passport control at Los Angeles International Airport (LAX). the pair were detained by armed guards. Despite telling officials the term destroy was British slang for party, they were held on suspicion of planning to commit crimes. They were held in cells for 12 hours and then put on a plane back home. The couple must now apply for a US visa should they ever want to travel to America again.

The Department of Homeland Security (DHS) was recently criticised over false accounts it set up on Twitter. These are then used to scan networks for sensitive words and then for tracking the people who use them. Online privacy group, the Electronic Privacy Information Centre requested information on the surveillance, but this was not forthcoming. However words deemed as being sensitive by the DHS include: Illegal immigrant, Outbreak, Drill, Strain, Virus, Recovery, Deaths, Collapse, Human to animal, and Trojan.

A public online consultation has been launched asking for views on the implementation of two new powers designed to spoil people's fun and depress the late night economy.

The measures, contained in the Police Reform and Social Responsibility Act 2011 and due to be introduced in the autumn, will empower local killjoys by:

• allowing local authorities to charge a levy for late-night licences to contribute to the cost of extra policing
• extending Early Morning Restriction Orders -- a power that will allow licensing authorities to restrict the sale of alcohol in all or part of their areas -- to any time between midnight and 6am

The consultation asks whether some types of premises should be exempted from the new measures, or eligible for a reduction in the levy, if they are judged not to be major contributors to the type alcohol-related crime and disorder that can blight neighbourhoods. Such premises could be hotels, cinemas or community venues.

Minister for Fun Prevention Lord Henley said:

Alcohol-related crime and disorder is a problem for many of our communities. These new measures give power back to local areas so they can respond to their individual needs.

But we also recognise that some types of premises that open late to serve alcohol do not contribute to late night drinking problems and should not be unduly penalised. That is why we are seeking views on whether they should be exempt or see a reduction in fees.

We are keen to hear from anyone who is affected by these new powers to help inform our plans to ensure the premises we have proposed are the right ones.

The public, licensing authorities, the licensed trade and police are all encouraged to contribute their views.

The consultation runs until 10 April 2012.

After Newham in London, Aberdeen Council has introduced a video system that gives council staff first sight of every visitor to residential properties.

Previously the video entry system connected the person at the door with the property they were trying to enter, and the person inside was able to see a video image of the person outside and, if they wished, remotely open the door.

Aberdeen Council has now written to residents informing them that they are going to change the system so it is a council operator who controls access, and gets to see who is visiting you. The letter reads:

When a non-resident calls your flat from the entrance, the call would be diverted to a centralised control room, where we will also monitor the current CCTV cameras in your building 24 hours a day. A member of staff from the control room would contact you directly and ask if you agreed to the non-resident being allowed access to the building.

Why should a council official be able to see the visitors to your flat before you do? It's no business who you have into your own property and the last thing residents need is a council official scrutinising everyone they invite round for a cup of tea.

Following the intervention of Big Brother Watch, the council has confirmed that residents who do not wish their visitors to be seen by a council official in the control room will be able to opt-out of the system.

Researchers have found that so called smart electricity meters can be used to determine what TV programmes people are watching.

German researchers have been looking over meters from the company Discovergy. They found that the fluctuating brightness levels of a film or TV show when displayed on a plasma-screen or LCD TV created fluctuating power-consumption levels. This creates a power/consumption signature for a film that might be determined from the readings obtained by Discovergy's technology.

The researchers also found that Discovergy apparently allowed information gathered by its smart meters to travel over an insecure link to its servers. The information -- which could be intercepted -- apparently could be interpreted to reveal not only whether or not users happened to be at home and consuming electricity at the time.

This was revealed during a presentation by researchers Dario Carluccio and Stephan Brinkhaus at the 28th Chaos Computing Congress (28c3) hacker conference in Berlin late last month.

During the talk, entitled, Smart Hacking for Privacy, the researchers explained that they came across numerous security and privacy-related issues after signing up with the smart electricity meter service supplied by Discovergy.

Because Discovergy's website's SSL certificate was misconfigured, the meters failed to send data over a secure, encrypted link - contrary to claims Discovergy made at the time before the presentation. This meant that confidential electricity consumption data was sent in clear text.

In addition, the researchers discovered that a complete historical record of users' meter usage was easily obtained from Discovergy's servers via an interface designed to provide access to usage for only the last three months. The meters supplied by the firm log power usage in two-second intervals. This fine-grained data was enough not only to determine what appliances a user was using over a period of time -- thanks to the power signature of particular devices -- but even which film they were watching.

The researchers concluded that the two-second frequency of power readings was unnecessary for Discovergy's stated goals. One has to ask why the sample rate was fast enough to determine customers viewing habits and what devices they are using and why a complete history of such information is being kept.

Travel insurers have been blasted by consumer watchdogs after record numbers of complaints by Britons who felt cheated by medical get-out clauses.

An investigation by Which? has accused insurers of changing terms after the policies are sold, often leaving British travellers without any cover.

A survey of 1,876 members found that nearly a third who told their travel insurance provider about a medical condition after they took out the policy had to pay a higher premium or had their cover removed.

Which? Travel says insurers include ongoing medical warranties in policies that they say allow them to change the terms after the policy is bought.

The report found cases of people who had their medical cover removed even though their doctor said they were fit to travel, and were left travelling with no insurance. Some then lost all medical cover because of a new minor illness.

But the magazine says the Financial Ombudsman Service ruled eight years ago that it was generally not fair and reasonable for insurers to exclude from cover medical conditions that arose between the start of the policy and the start of the trip. It said this would be reasonable only if the change was so fundamental that the risk that was being insured became completely different.

Which? Travel said: The FOS is now receiving more complaints about the issue than ever before -- about 40-50 complaints every month -- up from about 20 a month three years ago. There is also concern within the insurance industry about the clauses.