Master Key Generation Method
Original Publication Date: 1978-Jul-01
Included in the Prior Art Database: 2005-Feb-21
When communicating sensitive information, such as a memorized personal identification number (PIN), from a remote terminal, encryption of the information with an algorithm, such as published January 15, 1977 in the Federal Information Processing Standards Publication 46, is desirable. One difficulty is in protecting the requisite master key at the terminal. If the master key is permanently stored at the terminal in nonvolatile storage, it is exposed to detection by detailed examination of the terminal. If the master key is stored in volatile storage, it must be reloaded manually by a trusted employee whenever power is turned off.