But Feist stressed reporters have an obligation to check the information campaigns disseminate, comparing and combining it with facts from other sources.

CNN: Media?manipulation is the message for campaigns

This removes the standard cross-check on a firm's tax return by comparing purchases of inputs with claimed output.

ECONOMIST: Taxes slip through the Net

By comparing a subset of the photons that Alice sends with what Bob measures, the pair can check for the presence of errors introduced by Eve.

ECONOMIST: Secure cryptography is only as safe as its weakest link