Which of these is the name for the failed key escrow device introduced by the National Security Agency in 1993?

The failed key escrow device introduced by the National Security Agency in 1993 is known as the Clipper Chip. This encryption chip was designed to provide secure communication while allowing the government to have access to the encrypted data by using a special key. However, it faced strong opposition due to concerns over privacy and the potential for abuse by the government. The Clipper Chip ultimately failed to gain widespread adoption and was discontinued.