In particular , for a randomly chosen input , if one flips the i-th bit , then the probability that the j-th output bit will change should be one half , for any i and j -- this is termed the Strict Avalanche Criterion .

In a cipher with good diffusion , flipping an input bit should change each output bit with a probability of one half -LRB- this is termed the Strict Avalanche Criterion -RRB- .
