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Using a VPN is a terrific 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 shot's iPhone, they asked Apple for 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 will become a target, a decoration for the poor guys. It will flow sooner or later. In a talk 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 poor guys can't get in either. .

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

Back in the day, in the event that you wanted to keep a document secret you can use a cipher to encrypt it and then burn the original. Or you might lock it up in a protected. The two main methods in encryption utilities parallel with these options.

One sort of product simply procedures files and folders, turning them into impenetrable encrypted versions of themselves. The other creates a virtual disc 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 are completely inaccessible. .

Similar to the virtual drive solution, some products save your encrypted information in the cloud. This strategy demands extreme care, obviously. Encrypted data in the cloud has a far larger attack surface than encrypted data on your own PC.

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That 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 provided by each one of those products to have a sense of the different options.

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

Some encryption products avoid this problem by encrypting the document in place, literally overwriting it on disc using an encrypted version. It's more common, though, to provide safe deletion as an option. If you choose something 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 check that retrieval tools. Hardware-based forensic retrieval works since the magnetic recording of information on a hard drive isn't actually digital. It's 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, picture, or other document into it, my website and you get back what sounds 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 depended on Advanced Encryption Standard (AES) as a standard, and all of the products gathered here support AES. Even the ones that support other calculations tend to recommend using AES.

If you are an encryption specialist, you might prefer another algorithm, Blowfish, perhaps, or the Soviet government's GOST. For the average user, 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 receive two keys. One is public; you can share it with anyone, register it in a key exchange, tattoo it on your foreheadwhatever you like. Another is personal, and should 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 a digital signature that proves your document came from you and hasn't been altered. How Exactly To encrypt it with your private key. The fact that your public key decrypts it's all the evidence you need. PKI service is less common than service for traditional symmetric algorithms. .

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

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