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

When the FBI needed information from the San Bernardino shooter's iPhone, they asked Apple for a rear 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 Since the moment a back door or similar hack is different, it will become a goal, a prize for the poor guys. It will leak sooner or later. In a talk at Black Hat last 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 thembut the bad guys can't get in either. .

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All of the products in this roundup explicitly state they have no back door, and that is as it should 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, in the event that you wanted to keep a document secret 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 these 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 digital drive, each the documents you put into it are completely inaccessible. .

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

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That 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 those products to have a sense of the different options.

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

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

Overwriting information 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 is more of a waveform. In simple terms, the process involves nulling out the known information and reading around the borders of what is left.

An encryption algorithm is like a black box. Dump a document, image, or other document into it, and you get back her response what sounds 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 depended on Advanced Encryption Standard (AES) as a standard, and all of the products accumulated here support AES. Even the ones that support other calculations tend to recommend using AES.

If you are an encryption specialist, you may want another algorithm, Blowfish, perhaps, or even the Soviet government's GOST. For the typical 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 receive two keys. One is public; you can share it with anyone, register it in an integral 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 simply encrypt it with your public key.

Simple! .

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Using this program in reverse, you can create an electronic signature which shows that your document came from you and hasn't been find more altered. How Exactly To encrypt it with your private key. The fact that your public key decrypts it's all of the proof 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 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 complimentary, decryption-only tool.

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