How to secure pendrive ?

["J.Bakshi" <j.bakshi () icmail net>]

Dear list,

I like to secure my 8GB pendrive.
I like to make two 4GB partitons, one for puppy linux and one as left to use 
as pendrive. But I like to encrypt the partition having puppy so that it is 
even not possible to access that partition even from Linux. It should ask 
password before accessing that partition. Could any one give me a direction 
to achieve this ?

thanks