# What does it means the security parameter K for cryptographic signatures schemes

Cryptographic schemes claim to use a security parameter K for deriving signing key and verification key. What does this parameter signify ? how can be chosen?

The security parameter (usually denoted $k,\lambda$ or $\kappa$) is the input to the algorithms of a cryptosystem against which we measure security. That is it should have no effect on correctness of the scheme but only its security against attacks.