1. A method of affecting a trustworthy-measure associated with a source node in a distributed network, comprising: receiving an information file from the source node and a corresponding identifying code that is based on content of the information file when the information file is introduced to the network, computing an associated code based on received content of the information file; comparing the associated code with the identifying code; and transmitting Fan error report to an administrator node, identifying the source node and the information file, when at least one of the following occur: the associated code does not correspond to the identifying code, and the content of the information file is abnormal; thereby facilitating a reduction of the trustworthy-measure associated with the source node.