Introduction to Computer Security, National Cryptologic School, (Interactive Courseware Trainee Guide) (formerly, CP-133) (37 zipped files, DOS program) – 1996-04-29
You can download it from the following link: https://packetstormsecurity.com/files/download/13882/in170.zip
Source: https://packetstormsecurity.com/files/13882/in170.zip.html