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Image watermark with PHP

in PHP added by webmonitore, on 22/5/2009 advanced tutorials beginner tutorials content management general php5 security

To prevent quality images being stolen, we can use PHP to watermark web-images in popular formats like GIF/PNG/JPEG. We print a transparent gif-image on a jpeg-photo in this tutorial.

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Creating a secure PHP contact form

in PHP added by sneakybox, on 6/10/2009 contact form mysql php5 secure

An in-depth tutorial explaining how to create a spammer-stopping PHP contact form for your website.

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User authentication with a secure cookie protocol in PHP

in PHP added by goodphptutorials, on 14/2/2010 advanced tutorials authentication cookie hmac security

The use of cookies introduces a few security issues. The data in the cookie is stored in plain text and can easily be modified or hijacked. Liu et al. (2005) propose a secure cookie protocol which we will use as a guideline in this example.

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The Horrors of C99.php

in PHP added by goodphptutorials, on 22/2/2010 c99 security

If you were a sysadmin a few years ago, and you had php on your servers, you’re probably already familiar with c99.

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Decoding a User Space Encoded PHP Script

in PHP added by goodphptutorials, on 14/5/2010 advanced tutorials encryption security

Every once in a while a new PHP encryption tool/service pops up and offers PHP “encryption”. Therefore the idea behind php-crypt that was announced today in the PHP Development forum of Xing is nothing new. Infact there are two types of PHP encryption systems source code obfuscators/encryptors/encoders and bytecode obfuscators/encryptors/encoders.

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How To Safely Store A Password

in PHP added by goodphptutorials, on 13/12/2010 bcrypt beginner tutorials security

These are all general purpose hash functions, designed to calculate a digest of huge amounts of data in as short a time as possible. This means that they are fantastic for ensuring the integrity of data and utterly rubbish for storing passwords.

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Preventing MySQL Injection

in PHP added by rosstanner, on 30/4/2012 MySQL injection database databases mysql php php5 security

In this tutorial I am going to explain what MySQL injection is and how important it is to prevent this attack on your database(s). It is vital that all security measures are in place before you make your website live because the effects can be devastating especially if you store sensitive data.

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