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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 local files. .

When the FBI needed information from the San Bernardino shooter's iPhone, they asked Apple to get a rear door to get past the encryption. However, no such back door existed, and Apple refused to create one. The FBI had to employ hackers to get into the phone.

Why wouldn't Apple help Because the moment a rear door or similar hack exists, it will become a target, a prize for the poor guys. It will leak sooner or later. In a talk 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 thembut the poor guys can't get in either. .

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Each the products in this roundup explicitly state that they have no rear door, and that's as it ought to be. It will mean that in the event you encrypt an essential document and then forget that the encryption password, then you have 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 might lock it up in a safe. The two main methods in encryption utilities parallel those options.

One type 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, acts like any other drive on your system. When you lock the digital drive, each of the documents that you put into it are entirely inaccessible. .

Similar to the digital drive solution, a few products save your encrypted information in the cloud. This strategy requires extreme care, obviously. Encrypted data 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 to use encryption. If you're not sure, take advantage of this 30-day free trial offered by each of those products to get a official statement feel for the different options.

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

Some encryption products avoid this issue by Resources encrypting the file in location, literally overwriting it on disc using an encrypted version. It's 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 information 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 process involves nulling out the known information and reading around the edges of what is left.

An encryption algorithm is like a black box. Dump a document, picture, or other document into it, and you get back what sounds like gibberish. Run that gibberish back via the box, with 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 merchandise gathered here service AES. Even those that support other calculations tend to recommend using AES.

If you are an encryption expert, you may want another algorithm, Blowfish, possibly, or even the Soviet government's GOST. For the average 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, register it in a key exchange, tattoo it on your foreheadwhatever you like. The other is personal, and should be carefully 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 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 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 tool doesn't support PKI, there are other 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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