For the Love of Ciphers: Cracking the S-Box …

With many block ciphers we use an s-box mapping (a scrambling function), where we take a value — normally one byte at a time - and map it…

For the Love of Ciphers: Cracking the S-Box …

With many block ciphers we use an s-box mapping (a scrambling function), where we take a value — normally one byte at a time - and map it to another unique value. This is defined as a scrambling function. The s-Box used in the encryption process in AES is:

So:

230F27CC

becomes:

2676cc4b

On the decryption part, we just reverse the s-Box:

So that our “2676cc4b” goes back to “230F2CC”.

Now can you crack these ciphers using one of the s-Boxes defined above:

43D166A3

5473889AA64310C4

Now go and crack some more:

S-box challenge
The following is the S-box mapping used in AES encryption:asecuritysite.com