TAPAK Collusion-resistant recipient attribution

Public instance, files are processed on this server

Registry Intact 90 entries
TAPAK product page

Public trial instance. Anyone can open these pages and see the documents issued here. Use sample documents, never real ones. Resolver addresses are shown without their host part.

Offline decoder · Chernoff threshold

Trace the source of a leak

Upload whatever leaked: a photo of a screen or of paper, a screenshot, a forwarded PDF or DOCX, or copied text.

Evidence

Page 1 of the chosen documentNo preview for DOCX
Leaked evidence Photos of each page from the same leak can be chosen together; the evidence is combined.
Or paste the leaked text · ignored because a file is chosen
Used when no file is chosen. Ctrl+Enter to trace.
Analysing the evidence. A photo takes a few seconds to straighten and read. This document has scanned pages: their word boxes are read again with Tesseract and those pages of the evidence are read as images, so it takes longer (example: one 2-page copy PDF takes about 40 seconds).

No trace result yet.

Each copy’s score is compared with the threshold Z, which is fixed before anyone’s score is computed. A name is given only when its score passes that threshold.