Polybius cipher

Polybius cipher is a basic form of encryption invented by the Ancient Greek Historian whose name it bears. It is based on fractionating plaintext characters so they can be represented by a smaller set of symbols. In plain English: all the letters of the alphabet are written in a 5×5 square like the one below:

. . . → Read More: Polybius cipher

Accessing POST data

Handling XML requests from PHP involves accessing the raw POST data. This can be done by accessing the $HTTP_RAW_POST_DATA variable, but this depends on having the always_populate_raw_post_data directive enabled in your php.ini. A less memory intensive alternative is php://input, which doesn’t need any special php.ini setting, but it’s not available for multipart/form-data requests.

Reading the . . . → Read More: Accessing POST data

Firefox 4.0 beta 1

Yesterday Mozilla released the first beta of Firefox 4. It includes a redesigned interface, more HTML 5 support and other features. It also brings a good laugh:

Download it HERE.

Vigenere cipher

Vigenere cipher is an encryption technique consisting of a sequence of Caesar cipher each based on the letters of a secret text called a keyword. This mechanism is classified as polyalphabetic substitution.

In Caesar substitution each letter was shifted a number of positions down the alphabet. For example choosing the secret key to be 5, . . . → Read More: Vigenere cipher

HTML 5 – features and support

HTML 5 is the next major revision of the HyperText Markup Language. It’s currently being developed as the next standard to present content on the World Wide Web. HTML 5 includes new features that were previously handled by various plugins. These new features include video and sound support, drag and drop, client side database storage, . . . → Read More: HTML 5 – features and support

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