Preventing distrubtion of modified or corrupted files

A method of facilitating control of distribution of modified or corrupted files in a distributed network, comprising:

• providing a catalog of available files to nodes of the distributed network, the catalog identifying each file of the available files and a corresponding source node of each file, processing an error report from a target node that received a downloaded file from a selected source node, verifying the error report, degrading a trustworthy-measure of at least one node of the distributed network based on a result of verifying the error report, and providing the trustworthy-measure of the at least one node to other nodes of the distributed network.

A method of controlling a trustworthy-measure associated with a source node in a distributed network, comprising:

• receiving, from a reporting node, a report of a modification or corruption of an information file by the source node, determining a validity of the report, and degrading the trustworthy-measure associated with the source node when the report is determined to be valid.

An administrator node in a communications network comprising a plurality nodes, that is configured to:

• receive a discrepancy report from a reporting node, the discrepancy report identifying a source node and an information file, verify the discrepancy report, and modify a trustworthy-measure associated at least one node of the plurality of nodes, based on whether the discrepancy report is valid.