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http://fr.wikipedia.org/wiki/Kryptos_%28sculpture%29 http://en.wikipedia.org/wiki/Kryptos

I read the Kryptos wikipedia page, is says it's crypted with a "modular transposition of lines and columns".

What is that ? How hard it is for a non-cryptanalist ?

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There are a number of useful articles written about Kryptos, that are very interesting to the amateur cryptographer such as myself - your best bet for this particular question is probably Frank Corr's post on derkeiler.

It uses two grids of dimensions 21 x 16 and 28 x 12. The plaintext ends up being written into the first grid by row, starting at the top row, and removed by column, starting with the last column and moving backward. It is then run through the second grid in the same way.

It is much easier to understand when described like that.

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