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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 to get a rear door to get past the encryption. But no such back door existed, and Apple refused to make one. The FBI had 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 goal, a prize for the poor guys. It will flow sooner or later. In a discussion at Black Hat this past summer, Apple's Ivan Krstic disclosed that the company has done something similar in their cryptographic servers.

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Apple can't update thembut the poor guys can't get in either. .

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All of the products in this roundup explicitly say they have no rear door, and that is as it should be. It does mean that if 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 secret you could use a cipher to encrypt it and then burn the original. Or you might lock it up in a protected. The two main methods in encryption utilities parallel those 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, behaves like any other drive on your system. When you lock the virtual drive, each of the files you put into it are completely inaccessible. .

Like the digital drive solution, a few products save your encrypted information in the cloud. This strategy requires extreme care, obviously. Encrypted data 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 offered by each of these products to get a feel for the different options.

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

Some encryption products avoid this issue by encrypting the file in location, literally overwriting it on disk using an encrypted version. It's more common, though, to offer secure deletion as an option. If you choose something that lacks this attribute, you ought to 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 data on a hard drive isn't actually digital. It's more of a waveform. In simple terms, the procedure involves nulling out the known information and reading around the borders of what's left.

An encryption algorithm is similar helpful resources to a black box. Dump a document, image, or other file into it, and you get back what seems like gibberish. Run that gibberish back via the box, using the 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 of the merchandise gathered here support AES. Even those that support other calculations tend to recommend using AES.

If you're an encryption specialist, you might prefer another algorithm, Blowfish, perhaps, or even the Soviet government's GOST. For the average user, 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 discuss it with anyone, register it in a key exchange, tattoo it on your foreheadwhatever you prefer. The other is personal, and should be carefully guarded. If I want to send you a secret document, I just encrypt it with your public key.

Simple! .

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

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

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