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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 regional files. .

When the FBI needed information from the San Bernardino shooter's iPhone, they asked Apple to get a rear door to get beyond the encryption. However, no such back door existed, and Apple refused to create 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 exists, it becomes a target, a prize for the bad guys. It'll 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 them, but the bad guys can't get in either. .

Each the products in this roundup explicitly say they have no back door, and that is as it ought to be. It does mean that if you encrypt an essential document and then forget that the encryption password, then you've lost it for good.

Back in the day, if you wanted to keep a document key 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 approaches in encryption utilities parallel these options.

One sort of product simply procedures files and folders, turning them into impenetrable encrypted versions of these. The other creates a virtual disk drive that, when open, acts like any other drive on your system. When you lock the virtual drive, all of the files that you put into it's entirely inaccessible. .

Similar to the virtual drive solution, some products store your encrypted data in the cloud. This approach requires extreme care, obviously. Encrypted information in the cloud has a much larger attack surface than encrypted data on your own PC.

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Which 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 offered by each one of those products to have a feel for the different options.

Once you copy a file 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 if you bypass the Recycle Bin, because the data still exists on disk, and data retrieval utilities can often get it back. .

Some encryption products avoid this problem by encrypting the file in location, literally overwriting it on disc 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 ought to 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 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 information and reading around the borders of what's left.

An encryption algorithm is like a black box. Dump a document, picture, or other document into it, and you get back what seems like gibberish. Run that gibberish back via the box, using 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 merchandise gathered here service AES. Even those that support other calculations tend to recommend using AES.

If you're an encryption expert, you may prefer another algorithm, Blowfish, possibly, or the Soviet government's GOST. For the typical 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 discuss it with anyone, register it in an integral exchange, tattoo it on your foreheadwhatever you prefer. The other is personal, and needs to be closely 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 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 simple fact that your public key decrypts it is all of the proof you need. PKI service is less common than support for traditional symmetric algorithms. .

If you want to talk about a document with someone and your encryption application informative post 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.