NCSC-TG-008: A Guide to Understanding Trusted Distribution in Trusted Systems 15 December 1988. (Dark Lavender Book)
You can download it from the following link: https://packetstormsecurity.com/files/download/13999/NCSC-TG-008.txt
Source: https://packetstormsecurity.com/files/13999/NCSC-TG-008.txt.html