Archive for the ‘Security’ Category

On April 6th, 2009 milburn wrote…

Mandelbrot Revisited

Canvas

The Mandelbrot Set

In my last post about the mandelbrot set I said:

I would put the Mandelbrot explorer script online however it is very computationally intense. It takes around 5 seconds to generate 1 image.

Now I have created a new explorer which you can use.

I tried to find a way of replicating my original PHP script in JavaScript. That way the processing is all done on the client computer and not my server. For a while I didn’t think it was possible until today I came across pixel manipulation using the Canvas element. Internet Explorer users will be disappointed to know that the Canvas element doesn’t work on their browser and this therefore won’t work. Read the rest of this entry »

On April 6th, 2009 milburn wrote…

Javascript Anaglyph Maker

mars My own anaglyph maker uses PHP to make anaglyphs from two images uploaded by a user. But I’ve found someone who has gone one step further. They’ve managed to make them using JavaScript alone. Unfortunately Internet Explorer fails miserably on this task. This is because his method uses the canvas object which so far is only supported by Firefox, Safari and Opera.

It simply loads the two images into two canvas elements and extracts the red channel from one of them and inserts that red channel into the other canvas. Hey presto you get a simple anaglyph. This method has another flaw. Modifying an images data channels can only be done from an image on the same domain to obey the same domain security policy. A small proxy sorts that out but means the solution isn’t all JavaScript. Read the rest of this entry »

On September 6th, 2008 milburn wrote…

Remembering Passwords

Remembering passwords is really difficult. No one has a different password for every site or machine they log into because no one can remember that many passwords easily. Is having the same password for every account good practise? We all know the answer to that question.

I have about five different passwords. I have a general password which I use for all the sites which aren’t very important and don’t store important details. I have another password for trusted sites and shops which store more information. I have a stronger password which I use for my bank account, I have a different password for my email and web hosting. Finally, my computer has a unique password. Read the rest of this entry »

On September 5th, 2008 milburn wrote…

Forgetting Passwords

Today, I forgot my password. I don’t have a habit of forgetting passwords however our school requires us to change passwords every 3 months. That’s obviously a good security practise but that means another password to invent.

4 months ago and I’m sure I could of told you what my password was. Unfortunately I only used the password two or three times so it didn’t sink in, then I went on holiday completely forgetting about everything school related including my password. Of course our school has some good computer technicians who promptly allowed me to change it. Read the rest of this entry »

Proudly powered by WordPress with plane theme by me! | © 2007 - 2017 Thomas Milburn | Valid CSS and HTML