It could just be an encryption key for select people to contact him...he and assange are kind of at war over leaks . He thinks assange should redact info
There was a tweet from snowden saying...its time.
My understanding was Snowdon was afraid that if not redacted the entire nation was at risk.
Assange has said recently that they are verifying materials. Maybe he has has second thoughts about redaction
Praying that Truth be exposed