Armory

This is about Shamir’s secret sharing scheme, where the main idea is based on having sufficient points to fully define a polynomial curve. A polynomial of degree t1t - 1 can only be constructed if tt points (shares) are known. In this challenge, only the first share is known, so it seems like we do not have any way of retrieving the value. However, we can observe two points: The coefficient cic_i is generated by calculating the SHA-256 hash of the previous coefficient ci1c_{i - 1}....

January 29, 2023 · 2 min · qvinhprolol