Distribution ensemble
Encyclopedia
In cryptography
, a distribution ensemble or probability ensemble is a family of distributions or random variable
s
where 
is a (countable) index set, and each 
is a random variable, or probability distribution. Often 
and it is required that each 
have a certain property for n sufficiently large.
A uniform ensemble
is a distribution ensemble, uniformly distributed over strings of length n.
Cryptography
Cryptography is the practice and study of techniques for secure communication in the presence of third parties...
, a distribution ensemble or probability ensemble is a family of distributions or random variable
Random variable
In probability and statistics, a random variable or stochastic variable is, roughly speaking, a variable whose value results from a measurement on some type of random process. Formally, it is a function from a probability space, typically to the real numbers, which is measurable functionmeasurable...
s
where is a (countable) index set, and each is a random variable, or probability distribution. Often and it is required that each have a certain property for n sufficiently large.A uniform ensemble
is a distribution ensemble, uniformly distributed over strings of length n.