  Quantum cryptography is going to find practically useful applications.
Recently some first quantum cryptographic solutions became available on the
market. For clients it is important to be able to compare the quality and
properties of the proposed products. To this end one needs to elaborate on
specifications and standards of solutions in quantum cryptography. We propose
and discuss a list of characteristics for the specification, which includes
numerical evaluations of the security of solution and can be considered as a
standard for quantum key distribution solutions. The list is based on the
average time of key generation depending on some parameters. In the simplest
case for the user the list includes three characteristics: the security degree,
the length of keys and the key refresh rate.
