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Using a VPN is a terrific way to protect your internet traffic when you are traveling, but it is not a solution for encrypting your regional files. .

When the FBI needed information from the San Bernardino shot's iPhone, they asked Apple for a rear door to get beyond the encryption. However, 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 back door or similar hack is different, it will become a target, a decoration for the bad guys. It'll flow sooner or later. In a discussion at Black Hat last summer, Apple's Ivan Krstic disclosed the company has done something similar in their cryptographic servers.

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Apple can't update them, but the poor guys can't get in either. .

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All the products in this roundup explicitly state that they have no rear 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, if 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 with these options.

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

Like the virtual drive solution, some products save your encrypted data in the cloud. This approach demands extreme caution, obviously. Encrypted data in the cloud has a much larger 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 are not sure, take advantage of the 30-day free trial provided by each one of these products to have a sense of the different options.

After you copy a document into protected storage, or create 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 disk, 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 disk using an encrypted version. It's more common, however, to offer secure 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 information before deletion is sufficient to balk software-based recovery tools. Hardware-based forensic retrieval works 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 edges 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 sounds like gibberish. Run that gibberish back through the box, using the 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 every one the merchandise accumulated here support AES. Even those that support other algorithms tend to recommend using AES.

If you're an encryption expert, you might want another algorithm, Blowfish, possibly, 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 get two keys. One is public; you can share it with anyone, register it in a key exchange, tattoo it on your foreheadwhatever you like. 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 program in reverse, you can create a digital signature that proves your document came from you and hasn't been modified. How Just encrypt it with your private key. The simple fact that your public key decrypts it is all of the proof you need. PKI support is less common than service for traditional symmetric algorithms. .

If you want to share a file with someone these details 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 could also find that the recipient can use a free, decryption-only get more tool.

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