The Can you crack it? challenge, run by GCHQ, is ending soon, so here are a few hints to those trying to crack the code. I’ll try not to give too much away, but this should be a help to people who are stuck.

I had an old Toshiba Portege M100 laptop which I wasn’t using, and recently decided to put it to good use: as a digital photo frame, and extra computer screen. It displays photos from a file server, automatically turns on and off, and can be used as an extra PC screen.

DroidPad works with Windows 7! (Tested on Win7 32 & 64-bit computers) Unfortunately, this does mean that DroidPad > 0.9.8 no longer supports Windows 2000, since this new version of PPJoy doesn’t. (Non-joystick functions will still work). I also made some videos to show the install process on Windows 7 64-bit and Windows XP 32-bit.

Decrypting the message is exactly the same process, but backwards.

This is basically the same as 3a, but this example works for any bitstrength.

Next, is converting the plaintext into a byte array. This bit does get quite confusing, so just hope that it works.

Next is the Public and private key generator. In my RSA Crypto program, I used threading so this wouldn’t interrupt the GUI, but you don’t have to.

I noticed when I wrote my RSA Crypto program that there was not that much on the internet about RSA in C#. Fortunately, .NET has a RSA algorithm, but it only accepts data in byte strings. This tutorial shows how to use RSA encryption in C# Programs. You will need: Visual C# 2008 express, Visual [...]

I noticed when I wrote my RSA Crypto program that there was not that much on the internet about RSA in C#. Fortunately, .NET has a RSA algorithm, but it only accepts data in byte arrays. This tutorial shows how to use RSA encryption in C# Programs.