iPhone Development online session

Peace be upon you

How are you? I have setup an even on dimdim, it will be nice if you join it, I will talk about iPhone development , here is the event presenation, check and see if there is anything u need to add or remove :), I am open for suggestion.

iPhone Development Presentation

here is the even widget, register for the even.



Thanks for your time.
BR
Ahmed Essam

Security presentation

Peace be upon you

Today I will not talk to much I have presentation to do I thought that it is better to add first on the blog :), anyways, this should the presentation at "Data Security" subject at the academy I am doing my diploma at, here is the presentation, please your feed back is very important

Thanks for your time.

BR

Ahmed Essam

MARS on iPhone

Peace be upon you

How are you guys? today I am going to show you something I have done as a data security assignment, the assignment was a presentation and application, me and other 3 guys were suppose to write something about MARS and Application, I helped in the Presentation and took the application :D, do you understand anything?

Well, let us begin the whole thing is about encryption algorithm called MARS, developer by IBM, you can find more about it

http://en.wikipedia.org/wiki/MARS_(cryptography)

And here is the presentation

So, the idea is to make application for the ready made code of IBM, so the plane was todo simple application that do simple encryption and decryption, here is snapshots for the application, you can find the code here (Cocoa Touch Objective C project)

http://cid-e2c1100334a33877.skydrive.live.com/self.aspx/.Public/Code%20For%20blog/iMARS.zip

Lets see the application.

The application starts with the operation, you have to select wither you want to encrypt or decrypt

Enter the operation Key, in this case the "Encryption key"

Enter the data that you want to encrypt.

Here is the result, and as we use OFB + Random IV, when you reencrypt by just clicking back and next, you will get anther result

HEre is anther result for the encryption due to the IV + OFB

3rd result , Thanks to the OFB and IV

Save the file

Lets do decryption for what we have encrypted

Select Decryption

Then enter the key

Select the file name, you can enter free text in this page.

Now you have got your data

I have added little part for some fun it is the Mode of Operation , you can read more about it here

http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation

The mode that I have used was "OFB, output feed back"

I hope that you enjoy the application and the presentation :)

Thanks for your time.

BR

Ahmed Essam