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

When the FBI needed information from the San Bernardino shooter's iPhone, they asked Apple for a back door to get beyond the encryption. But no such back door existed, and Apple refused to create one. The FBI needed to employ hackers to get into the phone.

Why wouldn't Apple help Because the moment a back door or comparable hack is different, it will become a target, a decoration for the poor guys. It'll flow sooner or later. In a discussion 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 bad guys can't get in either. .

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

Back in the day, in the event that you wanted to maintain a document secret you could use a cipher to encrypt it and then burn the original. Or you might lock it up in a safe. The two main approaches in encryption utilities parallel with these options.

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

Like the digital drive solution, some goods store your encrypted data in the cloud. This strategy requires extreme care, obviously. Encrypted data in the cloud has a far larger attack surface than encrypted data on your own PC.

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

After you copy a document into protected storage, or create an encrypted version of it, then you definitely need to wipe the unencrypted original. Simply deleting it isn't sufficient, even in the event that you bypass the Recycle Bin, since the information still exists on disk, and data retrieval utilities can often get it back. .

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

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

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

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The U.S. government has settled on Advanced Encryption Standard (AES) as a standard, and all the products gathered here service AES. Even the ones that support other algorithms tend to recommend using AES.

If you're an encryption specialist, you may prefer another algorithm, Blowfish, perhaps, or the Soviet government's GOST. For the average consumer, however, AES is just fine.

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

With PKI, you get two keys. One is public; you can share it with anyone, enroll it in an integral exchange, tattoo it on your foreheadwhatever you prefer. The other is private, and needs to be carefully guarded. If I try this out 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 make an electronic signature which proves your document came from you and hasn't been modified. How Exactly To encrypt it with your private key. The simple fact your public key decrypts it's all of the evidence you need. PKI support is less common than support for traditional symmetric algorithms. .

If you want to share a file with someone and your encryption application 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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