Under an agreement that is still being finalized, the National Security Agency would help Google analyze a major corporate espionage attack that the firm said originated in China and targeted its computer networks, according to cybersecurity experts familiar with the matter. The objective is to better defend Google — and its users — from future attack.

Google to enlist NSA to help it ward off cyberattacks

The pact would be aimed at allowing the NSA help Google understand whether it is putting in place the right defenses by evaluating vulnerabilities in hardware and software and to calibrate how sophisticated the adversary is. The agency’s expertise is based in part on its analysis of cyber-”signatures” that have been documented in previous attacks and can be used to block future intrusions.

The NSA would also be able to help the firm understand what methods are being used to penetrate its system, the sources said. Google, for its part, may share information on the types of malicious code seen in the attacks — without disclosing proprietary data about what was taken, which would concern shareholders, sources said.

Greg Nojeim, senior counsel for the Center for Democracy & Technology, a privacy advocacy group, said companies have statutory authority to share information with the government to protect their rights and property.