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Using a VPN is a great way to protect your internet traffic when you are 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 create one. The FBI had 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 becomes a goal, a prize for the poor guys. It'll 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. .

Each of the products in this roundup explicitly state that they have no back 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, you have lost it for good.

Back in the day, in the event that 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 protected. 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 disc drive that, when open, acts like any other drive on your system. When you lock the virtual drive, all the documents you put into it are entirely inaccessible. .

Similar to the digital drive solution, some goods store your encrypted data in the cloud. This approach demands extreme care, obviously. Encrypted data in the cloud has a far bigger attack surface than encrypted data on your own PC.

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That is better It actually depends on how you plan to use encryption. If you're not sure, take advantage of the 30-day free trial provided by each of those products to get a feel for the different options.

After you copy a document into secure storage, or make an encrypted version of it, then 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 data still exists on disc, and data retrieval utilities can often get it back. .

Some encryption products prevent this problem by encrypting the file in location, literally overwriting it on disc with an encrypted version. It's more common, though, to provide safe 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 retrieval 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 procedure involves nulling out the known data and reading around the borders of what's left.

An encryption algorithm is similar to a black box. Dump a document, picture, or other document into it, view 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 settled on Advanced Encryption Standard (AES) as a standard, and every one the products gathered here support AES. Even the ones that support other algorithms tend to recommend using AES.

If you're an encryption expert, 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 have to keep them secret, 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, enroll it in an integral exchange, tattoo it on your foreheadwhatever you prefer. The other is personal, and needs to 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 system in reverse, you can make 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's all the evidence 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 enable creation of a self-decrypting executable file. You may also find that the recipient can use a complimentary, decryption-only tool.