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In the paper Fully Homomorphic Encryption over the Integers in the introduction:

How do I calculate $r$ and $q$ of this equation in the picture?

$r \approx 2^{\sqrt{\eta}}$ and $q \approx 2^{\eta^3}$

what is the meaning of symbol like $\eta$ in the picture?

$p\in [2^{\eta-1},2^\eta)$

and how calculate it?

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    $\begingroup$ Welcome to Crypto.SE. Please edit your question and add a link to the paper you're quoting. $\endgroup$
    – e-sushi
    Sep 24, 2014 at 12:11
  • $\begingroup$ It's just the key size, which is a parameter. $\endgroup$
    – otus
    Sep 24, 2014 at 17:52

1 Answer 1

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η is the bit-length of the secret key (which is the hidden approximate-gcd of all the public-key integers),

SO u can calculate given functions and P should be the key that will be used and it should be between [2^η−1,2^η)

Hope this answers your question

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