def all
      result = []
      @backend.transaction(true){
        @backend[:user].each{|k,v| result << EntryMapper.from_json(decrypt(v))}
      }
      result
    end
def all
      result = []
      @backend.transaction(true){
        @backend[:user].each{|k,v| result << EntryMapper.from_json(decrypt(v))}
      }
      result
    end
Return all entries as array