Paul Kocher was invited to give an invited presentation at Crypto and CHES, which was certainly deserved on the 20th anniversary of his paper that has more than 3500 citations on Google Scholar. The content of his talk ranged from tales of his work over philosophical considerations on security to an outlook to the future. It was interesting to see how Kocher, a biologist by training, got into cryptography and managed to break implementations via side channels with rather cheap equipment, includi