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Using a VPN is a terrific way to protect your internet traffic when you are traveling, but it is 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 rear door to get beyond the encryption. However, no such back door existed, and Apple refused to create one. The FBI needed to hire hackers to get into the phone.

Why wouldn't Apple help Since the moment a back door or comparable hack exists, it becomes a goal, a prize for the bad guys. It will leak sooner or later. In a discussion 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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All the products in this roundup explicitly say that they have no rear door, and that's as it should be. It does mean that if you encrypt an essential document and then forget the encryption password, then you have lost it for good.

Back in the day, in the event that you wanted to maintain a document key 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 those options.

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

Similar to the virtual drive solution, some products save your encrypted data in the cloud. This approach demands 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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Which is better It actually depends on how you plan to use encryption. If you are not sure, take advantage of this 30-day free trial offered by each of those products to have a sense of the different options.

After you copy a document into secure storage, or make visit the site an encrypted version of it, then 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 data recovery utilities can often return back. .

Some encryption products avoid this problem by encrypting the document in place, literally Home Page overwriting it on disk using an encrypted version. It's more common, though, to offer secure deletion as an option. If you choose a product that lacks this feature, you ought to 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 process involves nulling out the known information and reading around the edges 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 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 depended on Advanced Encryption Standard (AES) as a standard, and every one of the products gathered here service AES. Even the ones that support other calculations tend to recommend using AES.

If you're an encryption expert, you may want another algorithm, Blowfish, possibly, or even the Soviet government's GOST. For the typical consumer, 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 get two keys. One is public; you can share it with anyone, register it in an integral exchange, tattoo it on your foreheadwhatever you prefer. Another 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 altered. How Just encrypt it with your private key. The simple fact your public key decrypts it is all the evidence you need. PKI service is less common than service for traditional symmetric algorithms. .

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

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