From un- + detect + -ability .
undetectability (uncountable )
The quality of being impossible or difficult to detect .
2006 , David Salomon, Coding for Data and Computer Communications [1] , →ISBN , page 345 :In particular, embedding capacity, robustness, and undetectability are mutually conflicting and cannot all be achieved by the same algorithm.
2008 , Encyclopedia of Information Science and Technology, Second ... [2] , →ISBN :The highest degrees of anonymity are undetectability and unobservability.
2010 , Information Hiding [3] , →ISBN , page 197 :On a high level, undetectability means that no efficient algorithm can distinguish between inter-packet delays of the legitimate traffic and steganographic traffic.