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Using a VPN is a terrific way to protect your internet traffic when you're traveling, but it's 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 back door to get past 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 rear door or similar hack exists, it will become a goal, a decoration for the bad guys. It will 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 thembut the bad guys can't get in either. .

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Each of the products in this roundup explicitly say they have no rear 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, you've lost it for good.

Back in the day, if you wanted to keep a document secret you could use a cipher to encrypt it and then burn the original. Or you could lock it up in a protected. 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 virtual drive, each of the documents that you put into it's entirely inaccessible. .

Similar to the virtual drive solution, some goods save your encrypted information in the cloud. This strategy requires 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're not sure, take advantage of this 30-day free trial provided by each of those products to get a sense of the different options.

After you copy a document into secure storage, or make an encrypted version of it, then you definitely need to wipe out the unencrypted original. Just deleting it isn't sufficient, even in the event that you skip the Recycle Bin, because the data still exists on disk, and data recovery utilities can often return back. .

Some encryption products prevent this problem by encrypting the file in location, literally overwriting it on disk with an encrypted version. It's more common, however, to offer safe deletion as an option. If you select something that lacks this feature, you should find a free secure deletion tool to use along with it. .

Overwriting data before deletion is sufficient to balk software-based recovery tools. Hardware-based forensic retrieval functions since 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 information and reading around the edges of what is left.

An encryption algorithm is similar to a black box. Dump a this content document, picture, or other file into it, and you get back what seems 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 settled on Advanced Encryption Standard (AES) as a standard, and every one of the products accumulated here service AES. Even those that support other calculations tend to recommend using AES.

If you are an encryption expert, you may want another algorithm, Blowfish, perhaps, or even the Soviet government's GOST. For the average user, however, AES is just fine.

Passwords are important, and you must 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 an integral exchange, tattoo it on your foreheadwhatever you prefer. The other is private, and needs to 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 make an electronic 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's all the proof you need. PKI support is less common than support for traditional symmetric algorithms. .

If you want to talk about a document with someone and your encryption application 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 free, decryption-only tool.

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