System for two-dimensional digital signing of an electronic student book

The invention relates to a system for an electronic student book and a method for secure management of the records in it.

Each record is signed two-dimensionally: once by the teacher who enters it and once by the institution which certifies it. The two signatures are verified independently, so that tampering with a grade requires both keys at the same time.

The method provides verifiability of the records without a central register and allows the book to be presented to third parties without revealing other data about the student.