This is all rather short on context. What encrypted files are these exactly? Are these something Snowden took with him? How did they get them from him? If they

This is all rather short on context. What encrypted files are these exactly? Are these something Snowden took with him? How did they get them from him? If they took a copy by force, why didn't they ask for an encryption key by force? How exactly would they go about cracking it? Is there something we don't know (and Snowden didn't know) about the state of the art of cryptography?