Encryption is undoubtedly the most complicated topic PHP programmers have to face, partially because encryption is inherently difficult, and partially because the PHP extension designed to handle encryption seems to have been designed for encryption experts to use, as opposed to normal people!
As such, many people teach PHP encryption by simply making PHP execute command-line tools such as PGP or GnuPG - this makes for good encryption, but poor use of PHP. We are going to be looking at proper encryption using PHP, and I have tried to make things as clear as possible without too much fluff.
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