(4) Master Lock Speed Dial decoding

If you're trying to get your lock open, check out Blank_Registration's decoding series: https://www.youtube.com/watch?v=y0sJF8kssUY Brute force PDF and full decoding worksheets: https://drive.google.com/file/d/1u3AgRIjficr5jQgkzEi9W6LfUoCii-G_/view Yes, it's possible to decode the Master Lock Speed Dial without mechanical tools or precomputed move tables. Still need a visualizer and some luck though :) This is a long session demonstrating some techniques to decode Speed Dials using hand manipulation. It does contain cuts, and I apologize for the video/audio problems and unevenness. I think that tool-unassisted decoding is possible for this lock, and this is meant to be a midway point in the progression of attacks from mechanically-assisted (like mh's padlock decoder tool,) to computer-lookup-assisted, visualizer-assisted, paper-assisted and then unassisted. 00:00 Introduction 00:47 Process and visualizer setup 01:26 Identify first binding disk (sticking-when-sliding) 03:08 Identify correct gate for first binding disk (LRU stepping) 04:05 Complications when finding gate on first disk 07:15 Approximate second binding disk (dragging) 09:05 Accidental open :P 12:12 Isolating second binding disk (high-low testing using preimage attack) 20:30 Identify correct gate for second binding disk (dragging & partial moves) 32:50 Solve third binding disk (partial moves) 42:42 False starts 45:28 Finding combination for first three disks 47:00 Solve last binding disk (preimage attack) 48:38 False starts 50:19 Back on track 54:44 Open! 56:25 Thank yous!! For mh's paper on this locking mechanism: https://toool.nl/Publications mh's Visualizer: https://prevarikation.github.io/knollan-visualizer/ Chris Ahrens' physical teardown of the lock: https://www.youtube.com/watch?v=X8vW9lD_j-w Blank_Registration's analysis: https://www.youtube.com/watch?v=faiO-YdEB-o Preimage attack on the hashing mechanism: https://www.youtube.com/watch?v=lnsw29QfYR0 Master_Unlocked's comment on decoding: https://blackbag.toool.nl/?p=183#comment-181131