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Using a VPN is a great way to protect 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 for a rear door to get past the encryption. However, no such back door existed, and Apple refused to create one. The FBI needed to employ hackers to get into the phone.

Why wouldn't Apple help Since the moment a back door or comparable hack is different, it becomes a goal, a decoration for the bad guys. It will leak sooner or later. In a talk at Black Hat last summer, Apple's Ivan Krstic disclosed 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. .

All of the products in this roundup explicitly state that they have no rear door, and that's as it should 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 maintain a document key you can 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 these options.

One type of product simply procedures files and folders, turning them into impenetrable encrypted versions of these. Another creates a virtual disc that, when open, behaves like any other drive on your system. When you lock the virtual drive, all of the documents you put into it are completely inaccessible. .

Like the virtual drive solution, some products store your encrypted information in the cloud. This strategy demands extreme caution, obviously. Encrypted information in the cloud has a much 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're not sure, take advantage of the 30-day free trial provided by each of those products to have a feel for the different options.

After you copy a file into secure storage, or create an encrypted version of it, then you definitely need to wipe the unencrypted original. Simply deleting it isn't sufficient, even if you bypass the Recycle Bin, because the information still exists on disk, and data recovery utilities can often return back. .

Some encryption products prevent this problem by encrypting the document in location, literally overwriting it on disc with an encrypted version. It's more visit the website common, though, to provide safe deletion as an option. If you select a product 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 recovery works because the magnetic recording of data on a hard drive isn't actually digital. It's more of a waveform. In simple terms, the process involves nulling out the known data and reading around the edges of what's left.

An encryption algorithm is similar to a black box. Dump a document, image, or other document 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 depended on Advanced Encryption Standard (AES) as a standard, and all the merchandise gathered here support AES. Even those that support other algorithms tend to recommend using AES.

If you're an encryption expert, you might prefer 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 discuss it with anyone, register it in an integral exchange, tattoo it on your foreheadwhatever you prefer. Another is personal, 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 program in reverse, you can make a digital signature that proves your document came from you and hasn't been modified. How Just encrypt it with your private key. The simple fact that your public key decrypts it is all of the evidence you need. PKI service is less common than service for great post to read traditional symmetric algorithms. .

If you want to share a file with someone and your encryption tool 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.