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Double Column Transposition Reloaded — Part 1 Level 3

by A. Wacker, Bernhard Esslinger, K. Schmeh, published on 12/11/2013

The double columnar transposition is considered to be one of the best manual encryption systems. This sequence considers vulnerabilities that have been used to solve the corresponding level X challenge. The three challenges of the sequence have an increasing difficulty. In the first part an English plaintext has been encrypted with keys derived from English sentences.