The New York Times reports: After disclosures about the National Security Agency’s stealth campaign to counter Internet privacy protections, a congressman has proposed legislation that would prohibit the agency from installing “back doors” into encryption, the electronic scrambling that protects e-mail, online transactions and other communications.

Representative Rush D. Holt, a New Jersey Democrat who is also a physicist, said Friday that he believed the N.S.A. was overreaching and could hurt American interests, including the reputations of American companies whose products the agency may have altered or influenced.

“We pay them to spy,” Mr. Holt said. “But if in the process they degrade the security of the encryption we all use, it’s a net national disservice.”

Mr. Holt, whose Surveillance State Repeal Act would eliminate much of the escalation in the government’s spying powers undertaken after the 2001 terrorist attacks, was responding to news reports about N.S.A. documents showing that the agency has spent billions of dollars over the last decade in an effort to defeat or bypass encryption. The reports, by The New York Times, ProPublica and The Guardian, were posted online on Thursday.

The agency has encouraged or coerced companies to install back doors in encryption software and hardware, worked to weaken international standards for encryption and employed custom-built supercomputers to break codes or find mathematical vulnerabilities to exploit, according to the documents, disclosed by Edward J. Snowden, the former N.S.A. contractor. [Continue reading…]