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As fast as it can, Google is sealing up cracks in its systems that Edward J. Snowden revealed the N.S.A. had brilliantly exploited. It is encrypting more data as it moves among its servers and helping customers encode their own emails. Facebook, Microsoft and Yahoo are taking similar steps.

After years of cooperating with the government, the immediate goal now is to thwart Washington — as well as Beijing and Moscow. The strategy is also intended to preserve business overseas in places like Brazil and Germany that have threatened to entrust data only to local providers. Google, for example, is laying its own fiber optic cable under the world’s oceans, a project that began as an effort to cut costs and extend its influence, but now has an added purpose: to assure that the company will have more control over the movement of its customer data.

A year after Mr. Snowden’s revelations, the era of quiet cooperation is over. Telecommunications companies say they are denying requests to volunteer data not covered by existing law. A.T.&T., Verizon and others say that compared with a year ago, they are far more reluctant to cooperate with the United States government in “gray areas” where there is no explicit requirement for a legal warrant.

The U.S. Department of Justice is pushing to make it easier for law enforcement to get warrants to hack into the computers of criminal suspects across the country. The move, which would alter federal court rules governing search warrants, comes amid increases in cases related to computer crimes. Investigators say they need more flexibility to get warrants to allow hacking in such cases, especially when multiple computers are involved or the government doesn’t know where the suspect’s computer is physically located. The Justice Department effort is raising questions among some technology advocates, who say the government should focus on fixing the holes in computer software that allow such hacking instead of exploiting them. Privacy advocates also warn government spyware could end up on innocent people’s computers if remote attacks are authorized against equipment whose ownership isn’t clear.

The government’s push for rule changes sheds light on law enforcement’s use of remote hacking techniques, which are being deployed more frequently but have been protected behind a veil of secrecy for years. In documents submitted by the government to the judicial system’s rule-making body this year, the government discussed using software to find suspected child pornographers who visited a U.S. site and concealed their identity using a strong anonymization tool called Tor. The government’s hacking tools—such as sending an email embedded with code that installs spying software — resemble those used by criminal hackers. The government doesn’t describe these methods as hacking, preferring instead to use terms like “remote access” and “network investigative techniques.” Right now, investigators who want to search property, including computers, generally need to get a warrant from a judge in the district where the property is located, according to federal court rules. In a computer investigation, that might not be possible, because criminals can hide behind anonymizing technologies. In cases involving botnets—groups of hijacked computers—investigators might also want to search many machines at once without getting that many warrants.

Some judges have already granted warrants in cases when authorities don’t know where the machine is. But at least one judge has denied an application in part because of the current rules. The department also wants warrants to be allowed for multiple computers at the same time, as well as for searches of many related storage, email and social media accounts at once, as long as those accounts are accessed by the computer being searched. “Remote searches of computers are often essential to the successful investigation” of computer crimes, Acting Assistant Attorney General Mythili Raman wrote in a letter to the judicial system’s rulemaking authority requesting the change in September. The government tries to obtain these “remote access warrants” mainly to “combat Internet anonymizing techniques,” the department said in a memo to the authority in March. Some groups have raised questions about law enforcement’s use of hacking technologies, arguing that such tools mean the government is failing to help fix software problems exploited by criminals. “It is crucial that we have a robust public debate about how the Fourth Amendment and federal law should limit the government’s use of malware and spyware within the U.S.,” said Nathan Wessler, a staff attorney at the American Civil Liberties Union who focuses on technology issues.