Archive for date: July 6, 2010

Visual Inspection of Chaocipher Output Implies Weakness

July 6, 2010 | Cryptography | By: Mark VandeWettering

So, first thing this morning, before I had even had coffee or blinked the sleep from my eyes, I decided to try a chosen plaintext attack against Chaocipher. I created a file consisting entirely of 2000 A’s, and passed it through Chaocipher. Here is my output: PKLSD MAVZC UXHEP KLSDM AVZCU XHEPK LSDMA VZCUX HEPKL […]