netkey - calculate response to authentication challenge netkey Netkey calculates a response to a challenge made by a system to authenticate a user, based on a shared secret (password), using the same algorithm as a SecureNet device. It reads and writes /dev/cons . It prompts once for the secret (echo is turned off). It then repeatedly prompts for a remote system's challenge, and once given it, calculates and prints the corresponding response. It exits on an empty challenge or end of file. /appl/cmd/netkey.b