Which tests are the most complicated ones?

Digging deep into how Git works

What are Merkle Trees - from tester’s point view

My thoughts on problems with modern testing

What is blockchain - from tester’s point view

Peer-to-peer and gossip protocols

A glance at distributed systems from the test engineer’s point of view

Digital signatures from tester’s point of view

Encryption from tester’s point of view

Hashing from tester’s point of view