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I'm developing an encryption software based on SEAL algorihm for my research. I found the paper in here

My Question is what is the meaning of $$ H_{i \operatorname{mod} 5}^i $$ in page 5?

Thanks in advance.

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    Please do not cross-post a question through several Stack Exchange sites ([Stack Overflow](http://stackoverflow.com/q/8464118/600500), [Security](http://security.stackexchange.com/q/9667/1396)).2011-12-11
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    I have closed the one on Security. Migrating it to math does not make sense as there is already a copy here.2011-12-11
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    thanks for correcting me Paulo and Hendrik..:)2011-12-11

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