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Using a VPN is a terrific way to protect your internet traffic when you're traveling, but it is not a solution for encrypting your local files. .

When the FBI needed information from the San Bernardino shot's iPhone, they asked Apple to get a rear door to get past the encryption. However, no such back door existed, and Apple refused to create one. The FBI had to hire hackers to get into the phone.

Why wouldn't Apple help Since the moment a rear door or similar hack is different, it will become a target, a prize for the bad guys. It will leak sooner or later. In a talk at Black Hat this past summer, Apple's Ivan Krstic revealed that the company has done something similar in their cryptographic servers.

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Apple can't update them, but the poor guys can't get in either. .

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Each of the products in this roundup explicitly say they have no back door, and that's as it should be. It does mean that in the event you encrypt an essential document and then forget the encryption password, you've lost it for good.

Back in the day, in the event that you wanted to maintain a document key you can use a cipher to encrypt it and then burn the original. Or you might lock it up in a safe. The two main methods in encryption utilities parallel those options.

One sort of product simply processes files and folders, turning them into impenetrable encrypted versions of these. The other creates a virtual disc that, when open, acts like any other drive on your system. When you lock the virtual drive, each of the files that you put into it's completely inaccessible. .

Like the virtual drive solution, a few products store your encrypted data in the cloud. This strategy demands extreme care, obviously. Encrypted information in the cloud has a much bigger attack surface than encrypted data on your own PC.

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Which is better It actually depends on how you plan on using encryption. If you are not sure, take advantage of this 30-day free trial provided by each of these products to get a feel for the different options.

Once you copy a document into secure storage, or create an encrypted version of it, you absolutely need to wipe the unencrypted original. Simply deleting it isn't sufficient, even if you skip the internet Recycle Bin, since the information still exists on disc, and data retrieval utilities can often get it back. .

Some encryption products avoid this problem by encrypting the document in place, literally overwriting it on disk with an encrypted version. It's more common, however, to provide safe deletion as an option. If you select a product that lacks this feature, you should find a free secure deletion tool to use along with it. .

Overwriting data before deletion is sufficient to balk software-based recovery tools. Hardware-based forensic recovery works because the magnetic recording of information on a hard drive isn't actually digital. It's more of a waveform. In simple terms, the process involves nulling out the known information and reading around the borders of what's left.

An encryption algorithm is similar to a black box. Dump a document, picture, or other document into it, and you get back what sounds like gibberish. Run that gibberish back through the box, with the exact same password, and you get back the original.

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The U.S. government has depended on Advanced Encryption Standard (AES) as a standard, and all of the merchandise accumulated here support AES. Even the ones that support other algorithms tend to recommend using AES.

If you are an encryption expert, you might prefer another algorithm, Blowfish, possibly, or the Soviet government's GOST. For the typical user, however, AES is just fine.

Passwords are important, and you must keep them secret, right Well, not when you use Public Key Infrastructure (PKI) cryptography.

With PKI, you receive two keys. One is public; you can share it with anyone, enroll it in a key exchange, tattoo it on your foreheadwhatever you prefer. Another is private, and needs to be closely guarded. If I want to send you a secret document, I simply encrypt it with your public key.

Simple! .

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Using this system in reverse, you can create an electronic signature which proves your document came from you and hasn't been modified. How Just encrypt it with your private key. The simple fact your public key decrypts it's all the proof you need. PKI service is less common than support for traditional symmetric algorithms. .

If you want to share a document with someone and your encryption tool doesn't support PKI, there are other options for sharing. Many products enable creation of a self-decrypting executable file. You could also find that the recipient can use a free, decryption-only tool.

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