A reference to the Clipper Chip (https://en.wikipedia.org/wiki/Clipper_chip) in “Memento Mori" (S4E14) from 1997.
The history of the Clipper Chip project is a fascinating story about the politics and history around strong #cryptography, #surveillance, and #privacy in the early 90s.
See the writing on this topic by @mattblaze (https://www.mattblaze.org/papers/escrow-acsac11.pdf) and @matthew_d_green (https://blog.cryptographyengineering.com/2015/07/20/a-history-of-backdoors/).
It is worth studying and for those who did not live through it.