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Using a VPN is a terrific way to protect your internet traffic when you're 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. 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 Since the moment a rear door or comparable hack is different, it will become a goal, a decoration for the poor guys. It'll flow sooner or later. In a talk at Black Hat last summer, Apple's Ivan Krstic disclosed 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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All the products in this roundup explicitly say they have no back door, and that's as it should be. It does mean that in the event 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 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 these options.

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

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

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Which is better It actually depends on how you plan on using encryption. If you're not sure, take advantage of try this site the 30-day free trial offered by each of those products to have a feel for the different options.

Once you copy a file into secure storage, or make an encrypted version of it, you definitely need to wipe out the unencrypted original. Simply deleting it isn't sufficient, even in the event that you bypass the Recycle Bin, since the information still exists on disc, and data recovery utilities can often get it back. .

Some encryption products avoid this problem by encrypting the document in location, literally overwriting it on disc using an encrypted version. It is more common, however, to offer safe deletion as an option. If you choose a product that lacks this attribute, you should find a free secure deletion tool to use along with it. .

Overwriting data before deletion is sufficient to balk software-based retrieval 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 data and reading around the edges of what is left.

An encryption algorithm is similar to a black box. Dump a document, image, 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 all of the products 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, possibly, or even the Soviet government's GOST. For the average user, however, AES is just fine.

Passwords are important, and you have to keep them confidential, 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, enroll it in an integral exchange, tattoo it on your foreheadwhatever you like. The other is personal, and should 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 program in reverse, you can create an electronic signature that shows that your document came from you and hasn't been altered. How Just encrypt it with your private key. The fact that your public key decrypts it's all the proof you need. PKI service is less common than support 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 complimentary, decryption-only tool.

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