https://www.vice.com/en_us/article/vb5qax/a-roundtable-of-hackers-dissects-mr-robot-season-4-episode-3-forbidden

We asked for more hacks, and Episode 3 of Mr. Robot’s final season delivered. We discussed [SPOILERS, obvs] SS7, breaking and entering, social engineering, multi-factor authentication, and getting into Olivia’s machine. (The chat transcript has been edited for brevity, clarity, and chronology.) This week’s team of experts include:

Micah: This season's episode titles are named after HTTP error codes. The first episode is called "401 UNAUTHORIZED", the second is "402 PAYMENT REQUIRED", etc.