# Stern identification scheme to signature scheme

I'm trying to understand the comment in the page 103 of the book Postquantum Cryptography. about convert the identification Stern procedure for signing. Can you write an example of signature of this conversion?

The standard method to convert the identification procedure into a procedure for signing, is to replace verifier-queries by values suitably derived from the commitments and the message to be signed.

In Sterns's id-scheme you have to choose a random element from the set $\{0,1,2\}$ for your message. That is $H(m)\in \{0,1,2\}.$ For instance if you have $H(m)=0$ then the signature of $m$ is $(c_1,\Pi).$