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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 local 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 make one. The FBI needed to employ 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 goal, a decoration for the poor guys. It will leak sooner or later. In a discussion 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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Each the products in this roundup explicitly state that they have no rear door, and that is as it should be. It will mean that in the event 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 could lock it up in a safe. The two main approaches in encryption utilities parallel with these options.

One sort of product simply processes files and folders, turning them into impenetrable encrypted versions of themselves. The other creates a virtual disc drive that, when open, behaves like any other drive on your system. When you lock the digital drive, each the documents you put into it's completely inaccessible. .

Similar to the digital drive solution, some goods store your encrypted information in the cloud. This strategy requires 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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That is better It actually depends on how you plan on using encryption. If you're not sure, take advantage of the 30-day read here free trial offered by each one of those products to get a feel for the different options.

Once you copy a file into protected storage, or make an encrypted version of it, then you definitely need to wipe the unencrypted original. Just deleting it isn't sufficient, even if you bypass the Recycle Bin, since the data still exists on disk, and data retrieval utilities can often return back. .

Some encryption products avoid this issue by encrypting the document in place, literally overwriting it on disc with an encrypted version. It's more common, however, 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 information 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, picture, or other file into it, and you get back what sounds 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 products gathered here support AES. Even the ones that support other algorithms tend to recommend using AES.

If you're an encryption specialist, you might prefer another algorithm, Blowfish, perhaps, or the Soviet government's GOST. For the average consumer, 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, register it in a key exchange, tattoo it on your foreheadwhatever you prefer. The other is private, and should be carefully guarded. If I want to send you a key 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 shows that your document came from you and hasn't been altered. How Exactly To encrypt it with your private key. The simple fact your public key decrypts it's all of the evidence you need. PKI service is less common than service for traditional symmetric algorithms. .

If you want to share a file with someone and your encryption application doesn't support PKI, there are different 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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