Anonymous tokens – implementation and development
FFI-Report
2022
About the publication
Report number
22/00178
Format
PDF-document
Size
861.6 KB
Language
English
Anonymous tokens can be used to provide one-time authentication for a service without revealing one’s
identity, and has been used as a CAPTCHA replacement and to provide additional anonymity in the Norwegian
COVID-19 contact tracing app, and more.
We demonstrate the practicality of implementing anonymous tokens with public metadata. Further, the
protocols are extended to include hidden public metadata, and improved batch verification across different
metadata. An attack on previously suggested batch verification is also demonstrated.
We envision further applications, for instance for services where the identity of some data submitting operative
is more sensitive than the data it submits.
About the publication
Report number
22/00178
Format
PDF-document
Size
861.6 KB
Language
English