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Using a VPN is a terrific way to protect 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 for a back door to get past 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 Since the moment a rear door or similar hack is different, it will become a goal, a prize for the bad guys. It'll flow 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 of the products in this roundup explicitly say they have no back door, and that is as it should be. It will mean that in the event you encrypt an essential document and then forget that the encryption password, you've lost it for good.

Back in the day, in the event that you wanted to maintain a document secret you can use a cipher to encrypt it and then burn the original. Or you could lock it up in a safe. The two main methods in encryption utilities parallel these options.

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

Like the digital drive solution, a few products save your encrypted information in the cloud. This approach demands extreme care, obviously. Encrypted information in the cloud has a far bigger attack surface than encrypted data on your own PC.

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That is better It really depends on how you plan on using encryption. If you're not sure, take advantage of the 30-day free trial offered by each one of those products to get a sense of the different options.

Once you copy a document into protected storage, or create an encrypted version of it, then you absolutely need to wipe the unencrypted original. Simply deleting it isn't sufficient, even in the event that you bypass the Recycle Bin, because the information still exists on disk, and data recovery utilities can often return back. .

Some encryption products prevent this issue by encrypting the file in place, literally overwriting it on disk with an encrypted version. It is more common, however, to provide secure deletion as an option. If you choose a product that lacks this attribute, you should 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 retrieval 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 like a black box. Dump a document, image, or other file into it, and you get back what sounds like gibberish. Run that gibberish back via the box, with the 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 gathered here service 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, possibly, or even 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 get two keys. One is public; you can share it with anyone, register it in a key exchange, tattoo it on your foreheadwhatever you site web prefer. Another is personal, and needs to be closely 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 program in reverse, you can create an electronic signature which proves your document came from you and hasn't been modified. How Exactly To encrypt it with your private key. The simple fact your public key decrypts it's all the proof you need. PKI service is less common than support for traditional symmetric algorithms. .

If you want to share a file with someone and your encryption tool 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 complimentary, decryption-only tool.

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