This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
GMR references.svg en GMR signature system authentication tree tree with root referece and signature chain de GMRSignatursystem Referenzbaum mit Wurzelreferenz und Signaturkette own Bananenfalter Cryptography diagrams
Page 2023 Free-images.com. All images are Public Domain