A .key file from the SAT is not a readable document—it is a cryptographic key. You do not "open" it; you "use" it through official software by providing your password. Treat it with the same care as your bank password or personal signature. With this guide, you can now correctly handle your .key file and complete your SAT procedures without unnecessary frustration.
La razón es que el archivo , sino una secuencia binaria o codificada que solo es interpretable por software criptográfico.
from cryptography.hazmat.primitives import serialization from cryptography.hazmat.backends import default_backend