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

When the FBI needed information from the San Bernardino shooter's iPhone, they asked Apple to get a back door to get beyond the encryption. However, no such back door existed, and Apple refused to create 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 is different, it will become a target, 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 revealed 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. .

All the products in this roundup explicitly say that they have no rear door, and that is as it should be. It will mean that if you encrypt an essential document and then forget the encryption password, you've lost it for good.

Back in the day, if you wanted to keep a document secret you can use a cipher to encrypt it and then burn the original. Or you could lock it up in a protected. The two main approaches in encryption utilities parallel with those options.

One sort of product simply processes files and folders, turning them into impenetrable encrypted versions of themselves. The other 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 you put into it are completely inaccessible. .

Similar to the digital drive solution, some products save your encrypted data in the cloud. This strategy demands extreme caution, obviously. Encrypted information in the cloud has a much 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're not sure, take advantage of this 30-day free trial offered by each of those products to get a feel for the different options.

Once you copy a file into protected storage, or create an encrypted version of it, 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 recovery utilities can often return back. .

Some encryption products prevent this problem by encrypting the document in place, literally overwriting it on disk with an encrypted version. It's more common, though, to provide secure deletion as an option. If you select something that lacks this attribute, 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 retrieval functions since 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 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 through 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 merchandise accumulated here support AES. Even the ones that support other algorithms tend to recommend using my explanation AES.

If you are an encryption expert, 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 share it with anyone, register it in a key exchange, tattoo it on your foreheadwhatever you prefer. Another is private, and should be closely guarded. If I want to send you a key document, I simply encrypt it with your public key.

Simple! .

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Using this program in reverse, you can create a digital signature which proves your document came from you and hasn't been modified. How Just encrypt it with your private key. The fact 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 document with someone and Bonuses 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.