Why do we have 10 keys for 128 bits in AES?

35 pts.
Tags:
AES
Application security
Security
I'm working on the project, making the information secure with the help of AES. I need to know a few details before I proceed into this project. Please provide me an easy to understand answer.

Software/Hardware used:
xylinx

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  • Subhendu Sen
    You have to follow Wikipedia or something like this. Also read good references to know answers.
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  • twinki1724
    I have already tried. But I'm not satisfied with the answers. So this is the last hope to know the answer. Please give me a straight point if you get it somewhere.
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  • CharlieBrowne

    Have you search the web for AES Encryption?

    Here is a link to one of the sites that come up.

    http://www.axantum.com/AxCrypt/etc/seagate128vs256.pdf

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  • Subhendu Sen
    See here, this can help you: http://www.tutorialspoint.com/cryptography/advanced_encryption_standard.htm.
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  • twinki1724
    Thank you for your help. But my question is why only 10 rounds for 128 bits of data. And not 11 rounds or 12 rounds. How are we calculating the rounds as per the bits we are working on. I have made the verilog code. I am very keen in understanding every bit of detail involved. That is why I feel I need to know the reason behind using only 10 rounds for 128 bits rather than 8,9,11,12 why is the most secure cipher produced using 10 rounds. Hope you guys are connecting with the main point I'm focusing on. I would appreciate further help. Thank you. :)
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  • twinki1724
    All the web pages tell that is uses 10 rounds for 128 bits, 12 rounds for 192 bits. But the reason they are choosing number of rounds is not specified.
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