Plausible Deniability
Plausible Deniability
Glaubhafte Abstreitbarkeit
Plausible deniability denotes the property of a system to credibly deny the existence of certain data — for instance through hidden, encrypted areas whose presence cannot be proven. The concept stems from cryptography and concealment. In forensics it is a challenge because it deliberately undermines provability.
History & facts. Technically, plausible deniability is realised for instance through hidden containers in which an encrypted area is indistinguishable from random data — without the matching key it cannot be proven that anything is hidden at all. Related is steganography, which conceals information in inconspicuous carriers. Both aim to obscure not only the content but already the existence of data.
Outlook & recommendation. For forensic practice this means: the absence of a find is no proof of the absence of data. Careful methodology, the documentation of anomalies (such as inexplicably large, apparently empty areas) and preservation of the chain of custody are particularly important here. The concept has legitimate protective applications as well as abusive ones — the assessment depends on the context.