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Using a VPN is a great way to shield your internet traffic when you are 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 rear door to get past 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 comparable hack is different, it will become a target, a prize for the bad guys. It will flow sooner or later. In a discussion at Black Hat last summer, Apple's Ivan Krstic revealed 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 say that they have no rear door, and that is as it ought to be. It will mean that in the event you encrypt an essential document and then forget the encryption password, 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 with those options.

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

Similar to the digital drive solution, some products save your encrypted data in the cloud. This strategy 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 on using encryption. If you are not sure, take advantage of this 30-day free trial provided by each one of these products to get a sense of the different options.

Once you copy a file into view it now protected storage, or create an encrypted version of it, you definitely need to wipe out the unencrypted original. Just deleting it isn't sufficient, even in the event that you bypass the Recycle Bin, since the information still exists on disk, and data recovery utilities can often get it back. .

Some encryption products prevent this problem by encrypting the document in location, literally overwriting it on disc using an encrypted version. It is more common, though, to provide safe deletion as an option. If you select something that lacks this feature, you ought to find a free secure deletion tool to use along with it. .

Overwriting data before deletion is sufficient to balk software-based retrieval tools. Hardware-based forensic recovery works because the magnetic recording of data 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 is left.

An encryption algorithm is similar to a black box. Dump a document, image, or other file into it, and you get back what seems 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 are an encryption specialist, you may prefer another algorithm, Blowfish, perhaps, or even the Soviet government's GOST. For the typical consumer, 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 an integral exchange, tattoo it on your foreheadwhatever you like. Another is personal, and should 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 system in reverse, you can create a digital signature which proves your document came from you and hasn't been altered. How Exactly To encrypt it with your private key. The fact your public key decrypts it is all of the proof you need. PKI service is less common than service for traditional symmetric algorithms. .

If you want to share a document with someone and your encryption tool doesn't support PKI, there are different options for sharing. Many products allow 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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