On the supersingular GPST attack

This work is incremental, as it clarifies limitations of an existing attack rather than introducing new methods or broad improvements.

The paper identifies and explains why the first Galbraith-Petit-Shani-Ti attack on Supersingular Isogeny Diffie-Hellman and Supersingular Isogeny Key Encapsulation fails in certain cases, addressing a specific vulnerability in these cryptographic schemes.