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Using a VPN is a terrific way to shield 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 rear door to get beyond the encryption. But 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 rear door or comparable hack is different, it becomes a goal, a prize for the poor guys. It'll leak 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 the products in this roundup explicitly say they have no rear door, and that is as it ought to be. It will 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 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 those options.

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

Similar to the digital drive solution, a few products store your encrypted information in the cloud. This strategy requires extreme care, obviously. Encrypted information in the cloud has a far bigger attack surface than encrypted data on your own PC.

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

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

Some encryption products prevent this issue by encrypting the document in location, literally overwriting it on disk with an encrypted version. It's more common, however, to provide secure deletion as an option. If you select something 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 data on a visit 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 borders of what is left.

An encryption algorithm is like a black box. Dump a document, image, or other file into it, and you get back what sounds like gibberish. Run that gibberish back via 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 products accumulated here service Virtual Investment Portfolio AES. Even the ones that support other calculations tend to recommend using AES.

If you are an encryption specialist, you might 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 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 discuss it with anyone, enroll it in a key exchange, tattoo it on your foreheadwhatever you like. The other is personal, and needs to be closely guarded. If I want to send you a secret document, I just encrypt it with your public key.

Simple! .

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Using this program in reverse, you can create an electronic signature which shows that your document came from you and hasn't been altered. How Exactly To encrypt it with your private key. The simple fact your public key decrypts it's all of the evidence you need. PKI support is less common than support for traditional symmetric algorithms. .

If you want to share a document 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 may also find that the recipient can use a free, decryption-only tool.

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