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Using a VPN is a great way to shield 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 shot's iPhone, they asked Apple to get a back door to get past the encryption. But 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 Because the moment a back door or similar hack is different, it will become a target, a prize for the poor 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. .

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Each the products in this roundup explicitly say they have no rear door, and that is as it should be. It does 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, in the event that you wanted to maintain a document key you could 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 these options.

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

Similar to the digital drive solution, some products save your encrypted data in the cloud. This strategy demands extreme caution, obviously. Encrypted data in the cloud has a far bigger 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 this 30-day free trial provided by each of those products to get a feel for the different options.

After you copy a document into protected storage, or make an encrypted version of it, then you definitely need to wipe out 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 recovery utilities can often get it back. .

Some encryption products avoid this problem by encrypting the file in place, literally overwriting it on disk using useful source an encrypted version. It is more common, though, to offer safe deletion as an option. If you select something that lacks this attribute, you ought to 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 recovery works 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 document, image, or other document into it, and you get back what sounds 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 depended on Advanced Encryption Standard (AES) as a standard, and all of the products accumulated here service AES. Even the ones that support other calculations 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 typical consumer, however, AES is just fine.

Passwords are important, and you must 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, enroll it in a key 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 simply encrypt it with your public key.

Simple! .

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Using this system in reverse, you can make a digital signature that shows that your document came from you and hasn't been modified. How Just encrypt it with your private key. The fact your public key decrypts it is all the evidence you need. PKI support is less common than service for traditional symmetric algorithms. .

If you want to talk about a file with someone and your encryption application doesn't support PKI, there are different options for sharing. Many products enable 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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