Lazybit

Backing up SIM cards and making copies of your contacts and SMS is the first thing you'd want to do if a SIM reader got into your hands.

However, there may be cases in which destroying data is more important than keeping them. In such cases it becomes a good idea to clear SIM card memory in order to prevent private information from getting into wrong hands. Here are a few examples:

• A distant friend visits you, you give them an old phone of yours and a spare SIM - such that they could keep in touch. You don't want them to look through your SMS or SIM contacts.
• The phone that you use is given to you by your employer, as you change jobs - you have to return the phone, but you don't want them to access your personal information (ex: the phone numbers of your family and friends, kept in the SIM phonebook, or the SMS you've been exchanging with your significant other).

In these circumstances, you should erase SIM card data before giving the card to anyone. This includes wiping SIM contacts, the SMS archive, the list of last dialled numbers, own numbers stored on the SIM card.

To clear SIM card memory, you have to manually go through each entry and delete it. This is a long and boring operation; besides that - there is a risk that you will accidentally miss some of the entries - simply because there are hundreds of records, and a monotonous operation that involves pressing buttons on a tiny key-pad of a mobile phone is error prone.

There is another risk - some phones do not delete the SMS, making deleted SMS recovery possible. So, when clearing a SIM card, the objectives are:

• erase all SIM card data (not just SMS or phone-book);
• wipe SMS, to make it impossible to restore deleted SMS;
• automate the process, to remove the possibility of human error.

The solution to this problem is SIM Manager's Clear SIM card feature, it does all of the above in a few clicks.

Besides that, with SIM Manager you can backup SIM cards before erasing them, thus you get to keep a copy of all the sensitive information from the SIM's memory.

Take a look at this video tutorial, which describes how to clear SIM card data without leaving a trace.

Note: The download link is obsolete, copy the final release version instead

A new version of Secrets Keeper is about to be released. It will be called Keeper. You can download a preview from this address: http://files.dekart.com/beta/Keeper-nohands.zip

An installer is not yet available, but we're working on it. At this point just unzip it. Run the included BAT file to enable the integration into MS Office and Windows Explorer.

Of course, no story is complete without screenshots, so here we go (screenshots are clickable):

Keeper's main window, nothing special in it, but notice that the main menu is not shown by default.

The key management window enables you to manage the passwords and contacts stored on your keys. Keeper will generate passwords for you, as well as evaluate their strength. You can have an unlimited number of groups and contacts in each group.

The email addresses will be used when you click the "encrypt and email" option.

The file encryption dialog. You can choose whether you wish to use a password from a key connected to the system (otherwise type it by hand). If you use a password from the key, you can choose which group to encrypt the data for.

• You can create self-extracting archives, so people who don't have Keeper on their computers can still decrypt the files you sent them (if they know the right password, of course);
• You can wipe the original files, to make sure they cannot be recovered using forensic methods. This is handy if you're encrypting your po world domination plans;
• Encrypt and email will automatically start the default mail client and create a new message, with the encrypted file attached to it.

The settings window looks like any other settings window.

Note that the update checking feature does not work yet, therefore if you wish to track Keeper's progress, check this page every now and then.

Keeper integrates itself into the Microsoft Office suite, enabling you to encrypt files or decrypt them from within Word, or other programs from Office.

Keeper 4 also integrates itself into the context (right-click) menu of Windows Explorer. This gives you quick access to features such as:

• File wiping - remove sensitive data without leaving a trace
• Encrypt
• Encrypt and email

If you right-click an encrypted archive, you will see options such as:

• Decrypt...
• Decrypt here
• Decrypt to <name of file>
• Decrypt each archive into separate directory (when selecting multiple archives)
• Decrypt each archive into separate directory and make me a cup of tea

As you can see, Keeper 4 is a huge step forward from Secrets Keeper 3.5. The new version is prettier, it provides an excellent user experience, and it will run on platforms other than Windows ;-)

So, you and your employer are not on good terms anymore and you think it is payback time? Here is a beginner's guide to expressing disagreement.

Disclaimer: the article does not focus on the moral and legal side of the issue, the focus is purely technical.

Note: a complementary article for employers will follow shortly, but if you're sharp enough you can derive the protection methods from this information.

The options are different, but if you're in the IT industry, the common choices are:

• change all the passwords and do not disclose them;
• delete all the data;
• encrypt all the data;
• apply subtle changes to the systems configurations, so that they seem to be working right, but somewhere deep inside a problem is waiting to happen;
• share private data with your employer's worst enemy.

Change all the passwords

It is a matter of time before they find a new person who knows how to apply the password reset procedure - most (if not all) systems have one. Sometimes it is as easy as reading the manual (which they should've told you to write in the first place) and following the instructions.

As an IT expert, you are aware of the fact that if someone has full physical access to a system - they can override pretty much every security measure.

Cons:

• it is a matter of time before they reclaim access to the resources. Since the bridges are already burnt down - your image suffers badly, your future employment opportunities are quite shady. You gained nothing.

Pros:

• easy to implement;
• it is more difficult and time consuming to get past this if there are remote resources (ex: servers) controlled by other companies, in other timezones;
• once they get everything back and sue you, you can say "I didn't want it to be serious, so I chose this trivial method" [then pray they'll buy that].

Delete all the data

This is a better approach, because in this case there is nothing to recover. They can have the passwords for every server, the key for every door - but there is nothing to be found behind any of the doors.

Cons:

• there are backups, you'll have to delete those too, thus there is more work to be done;
• there are data recovery techniques, you'll have to make sure they won't work
  • destroy the data (crash the hard disks; burn the DVDs, literally);
  • wipe the data - wiping is the process of deleting data, then overwriting it with other data, to prevent recovery software from being able to retrieve the original files. In spite of the belief that you need multiple overwrite-passes to make a file impossible to recover - even one pass is good enough.

Pros:

• the more time passes since the files were deleted, the more difficult it is to recover them. The employer will feel a lot of pressure because they have to do everything fast, or they'll have to disrupt the service for a while. This should make it evident for them that they should've given you the raise you asked for, it would've cost them less;
• if you were unprofessional enough to not make those regular backups, the employer will understand that they made more mistakes than they originally thought, one of them was that of employing you in the first place.

Encrypt all the data

This is an extension of the previous method, and it is psychologically more aggressive, because this time they know they have the files, and "all they need" is the password. This gives them the false feeling that they're almost there.

Cons:

• encrypting data takes time, especially if there are large amounts of it;
• you may be foolish enough to use an encryption program that has backdoors in it - which makes your effort useless;
• the employer may have keyloggers installed on your systems, thus they will be able to find the password - rendering the exercise useless again;
• if you use a weak password - they can guess it or brute-force it.

Pros:

• the method is meaner than simply deleting the data;
• even if they have full physical access to the system - it does not help them;
• if you are sure that you are using the best encryption program that does not have any backdoors and employs the best encryption algorithm, you're safe;
• if you use a smart card to encrypt the data, any brute-force or dictionary attack attempts will be futile.

Apply subtle changes to the systems configurations, etc.

If you need an example of this, remember the movie "Office space" to get an idea about how this is done.

Cons:

• they won't know you've had them, because these backdoors are so subtle - thus you lose some of the moral satisfaction;

Pros:

• when the new guy shows up, it may take a long time until the flaws are revealed (especially if you were insightful and weren't kind enough to document what you were working on, making it difficult to understand the system you left behind);
• you can exploit these flaws for many years, and perhaps get some benefits out of it. If you're not greedy and keep everything below the radar, you may never get caught.

Share corporate secrets with the competition

If you are not bound by an NDA, they won't be able to use this against you.

Cons:

• if you don't keep this low profile, future employers won't be able to trust you, and your career may not get far from where you're standing.

Pros:

• if there were no NDAs, technically you succeeded in making them suffer without breaking the law.

Final thoughts

All the methods above have one thing in common - you'll have to pay for it sooner or later, and there is no approach that enables you to get away scot-free.

I do not encourage employees to cheat their employers (and vice-versa), I consider that a direct dialogue is the best way to solve a problem, as well as to prevent it from happening in the first place. This article must not to be used as legal advice.