Cursed Ciphers: The Shared Secret

The archive saved its strongest lock for last.

At first glance, everything is exactly as it should be. The numbers are familiar, the construction is trusted, and the challenge appears to rest on a problem that has resisted generations of mathematicians.

Appearances have misled investigators before.

Whoever built this exchange believed they had chosen a foundation that would outlive scrutiny. They never questioned the foundation itself.

The final secret has been waiting there ever since.

Objective: Recover the hidden flag.