'Your leader (March 7) on some of the implications of the regulation of investigatory powers (RIP) bill was wrong on one important count: there is no presumption of guilt. Before a person might be convicted of failing to produce for the police the necessary key to decrypt an encrypted file, a jury has to be convinced that the person concerned was in possession of that key. A jury would therefore be invited to conclude that the person's failure now to produce the key was simply an attempt to avoid disclosing the content of their encrypted messages or files.' link