“In an ideal world, words like cryptography and security
wouldn’t even exist, but the real world is far from perfect, so
software developers have to spend a good deal of time building
security into applications. Cryptography is just one piece of the
security puzzle, along with SSL/TLS, certificates, digital
signatures, and so on. This article explains how to use PHP to
implement the most common cryptographic algorithms. In addition to
describing PHP’s default encryption functions, you’ll see how to
use a wide variety of cryptographic libraries and packages…”