WikiLeaks has released a trove of encrypted “insurance” data on Twitter and Facebook. The data can’t be read without an encryption key, but the movement’s supporters say that could be published later in case anything happens to leading WikiLeaks figures.

The whistleblowing organization published links for a massive 400 gigabytes worth of encrypted data it described as “insurance documents” on its Twitter and Facebook accounts. It is possible to download the files but advanced encoding prevents them from being opened. The group described encryption as a necessary measure in light of previous attempts to block its leaking of classified information.