Proceso por el que se genera una clave a partir de
cierta información secreta y, opcionalmente, alguna información adicional.
A function in the lifecycle
of keying material; the process by which one or more keys are derived from a
shared secret and other information. [NIST-SP800-57:2007]
a function that maps octet
strings of any length to octet strings of an arbitrary, specified length, such
that it is computationally infeasible to find correlations between inputs and
outputs, and such that given one part of the output, but not the input, it is
computationally infeasible to predict any bit of the remaining output. The
precise security requirements depend on the application. [ISO-18033-2:2006]
a key derivation function
outputs one or more shared secrets, used as keys, given shared secrets and
other mutually known parameters as input. [ISO-15946-3:2002]