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

Why wouldn't Apple help Because the moment a rear door or similar hack exists, it becomes a goal, a prize for the bad guys. It'll flow sooner or later. In a discussion at Black Hat last 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 bad guys can't get in either. .

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Each the products in this roundup explicitly say that they have no rear door, and that's as it ought to be. It does mean that if you encrypt an essential document and then forget that the encryption password, you have 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 could lock it up in a protected. The two main approaches in encryption utilities parallel with these options.

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

Like the virtual drive solution, a few products save your encrypted information in the cloud. This approach requires extreme care, obviously. Encrypted information 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 the 30-day free trial provided by each of those products to have a feel for the different options.

Once you copy a document into secure 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 skip the Recycle Bin, because the data still exists on disk, and data recovery utilities can often return back. .

Some encryption products avoid this issue by website here encrypting the file in location, literally overwriting it on disc with an encrypted version. It's more common, however, to offer safe deletion as an option. If you select a product that lacks this attribute, 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 data on a hard drive isn't actually digital. It's more of a waveform. In simple terms, the process involves nulling out the known data and reading around the borders of what's left.

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

If you're an encryption specialist, you may want another algorithm, Blowfish, perhaps, 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 a key exchange, tattoo it on your foreheadwhatever you like. Another is private, and should be carefully 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 an electronic signature which shows that your document came from you and hasn't been altered. How Just encrypt it with your private key. The simple 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 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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