WASHINGTON - The Obama administration is pushing to make it easier for the government to tap into internet and e-mail communications. But the plan has already drawn condemnation from privacy groups and communications firms may be wary of its costs and scope.

Frustrated by sophisticated and often encrypted phone and e-mail technologies, U.S. officials say that law enforcement needs to improve its ability to eavesdrop on conversations involving terrorism, crimes or other public safety issues.

Critics worry the changes are an unnecessary invasion of privacy and would only make citizens and businesses more vulnerable to identity theft and espionage.

The new regulations that would be sent to Congress next year would affect American and foreign companies that provide communications services inside the U.S. It would require service providers to make the plain text of encrypted conversations - over the phone, computer or e-mail - readily available to law enforcement, according to federal officials and analysts.

The mandate would likely require companies to add backdoors or other changes to the systems that would allow a wiretap to capture an unscrambled version of a conversation.

Those affected by the changes would include online services and networking sites such as Facebook and Skype, as well as phone systems that deliver encrypted e-mail such as BlackBerry.