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Using a VPN is a great way to shield 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 for a back door to get beyond the encryption. But no such back door existed, and Apple refused to make one. The FBI had to hire hackers to get into the phone.

Why wouldn't Apple help Because the moment a rear door or similar hack exists, it will become a target, a prize for the poor guys. It will flow sooner or later. In a talk at Black Hat this past summer, Apple's Ivan Krstic revealed 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 state that they have no rear door, and that's as it ought to be. It will mean that if you encrypt an essential document and then forget that the encryption password, then you've lost it for good.

Back in the day, if 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 approaches in encryption utilities parallel those options.

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

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

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That is better It really depends on how you plan to use encryption. If you are not sure, take advantage of this 30-day free trial provided by each one of those products to get a sense of the different options.

After you copy a document into protected storage, or make an encrypted version of it, then you definitely need to wipe out the unencrypted original. Just deleting it isn't sufficient, even if you skip the Recycle Bin, because the information still exists on disk, and data recovery utilities can often return back. .

Some encryption products prevent this issue by encrypting the document in location, literally overwriting it on disc using an encrypted version. It is more common, however, to provide secure deletion as an option. If you choose 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 retrieval tools. Hardware-based forensic recovery functions because the magnetic recording of information on a hard drive isn't actually digital. It is more of a waveform. In simple terms, the process involves nulling out the known data and reading around the borders of what is left.

An encryption algorithm is similar to a black box. Dump a document, picture, or other file 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 support AES. Even my site the ones that support other calculations tend to recommend using AES.

If you're an encryption specialist, you might want another algorithm, Blowfish, possibly, or the Soviet government's GOST. For the average user, however, AES is just fine.

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

With PKI, you receive two keys. One is public; you can discuss it with anyone, enroll it in an integral exchange, tattoo it on your foreheadwhatever you like. The other is private, and should 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 that shows that your document came from you and hasn't been altered. How Just encrypt it with your private key. The fact your public key decrypts it is all of the evidence you need. PKI support is less common than service for traditional symmetric algorithms. .

If you want to share a document with someone and your encryption tool doesn't support PKI, there are different options for sharing. Many products allow 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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