Clipper chip

The Clipper chip was a special type of chipset made by the United States National Security Agency (NSA) in the early 1990s. It was meant to help keep voice and data messages safe by using encryption.

The chip had a hidden part called a backdoor. This backdoor allowed government agencies to read messages if they were ever caught during communication.

The goal of the Clipper chip was to give everyday users security while also letting law enforcement access information in special cases. It was suggested for companies that send voice messages and data over long distances.

Introduced in 1993, the Clipper chip was not used much. By 1996, it was no longer in use. The story of the Clipper chip is an important part of the history of technology and talks about privacy and security online.

Key escrow

The Clipper chip used a special way to send information, created by the National Security Agency.

The main idea was key escrow. When a new device with a Clipper chip was made, it had a secret code given to the government. If the government had permission, they could use this code to read messages sent by that device.

Clinton Administration

The Clinton Administration thought the Clipper chip was important. They believed it would help law enforcement keep people safe as technology improved in the United States. Some people worried the device might help bad people, but the Administration said it would actually help keep the country secure. They thought it would make it easier for the government to monitor important communications.

Other proponents

Some people supported the Clipper chip. They thought it was safe and helpful. They said it could help police and other officials read secret messages with permission. Howard S. Dakoff wrote in a law journal that the technology was secure. Stewart Baker wrote in Wired magazine about what he believed were misunderstandings about the chip.

Backlash

Groups like the Electronic Privacy Information Center and the Electronic Frontier Foundation spoke up about the Clipper chip. They were concerned that it might let the government see people's messages too closely. They also worried because the chip's design was kept secret, so no one could check if it was safe.

Because of these concerns, strong encryption tools like Nautilus, PGP, and PGPfone became more popular. People thought these tools would remain available, no matter what the government did.

Technical vulnerabilities

In 1994, a researcher named Matt Blaze found a big problem with the Clipper chip. The chip used a special 128-bit code to unlock messages, but it had a weak 16-bit check to protect this code. This check was not strong enough, and someone could make a fake code to trick the chip.

In 1995, two other experts found another way around the chip’s security. They showed that the code from one chip could be used with messages from a different chip. This let people bypass the system that was meant to help law enforcement. These discoveries showed serious weaknesses in how the Clipper chip was designed to keep information safe.

Main article: Protocol Failure in the Escrowed Encryption Standard

Lack of adoption

The Clipper chip was not widely accepted by people or companies. By 1996, it became unimportant. The main buyer of phones with this chip was the United States Department of Justice. The U.S. government tried to encourage the use of a system called key escrow by giving rewards to companies. This would have made it easier to export certain types of software.

However, the growth of strong encryption technologies like PGP made these efforts less effective. These technologies were not controlled by the U.S. government. Even today, most cell phone calls are not strongly encrypted. There are secure phone devices and smartphone apps, but they often need special hardware. Both people in a conversation must use the same encryption method. These apps usually send messages through secure Internet paths, such as ZRTP, rather than regular phone networks.

Later debates

After the Snowden disclosures in 2013, companies like Apple and Google started using strong encryption on smartphones. This means that not even the companies could see users' data. Some law enforcement officials were worried because they thought it would make it harder to solve some crimes. Some people suggested ways for the government to access encrypted data when needed, but others said these ways could create big security risks and privacy problems.