I suspect it's hard to answer your question meaningfully. How do we ignore what we know about Enigma and still have modern cryptography? It depends on which En

I suspect it's hard to answer your question meaningfully. How do we ignore what we know about Enigma and still have modern cryptography? It depends on which Enigma code and how much knowledge you know about the context of the message. Looking around, you can start with https://www.cryptool.org/en/cryptool2 https://www.cryptool.org/en/cryptool2 : > CrypTool 2 provides a variety of cryptanalytical tools to analyze or even break classical and modern ciphers. With the current version you can, for instance, apply a ciphertext-only attack on an Enigma-encrypted ciphertext https://en.wikipedia.org/wiki/Cryptanalysis_of_the_Enigma#Since_World_War_II https://en.wikipedia.org/wiki/Cryptanalysis_of_the_Enigma#Si... points to http://www.tandf.co.uk/journals/pdf/papers/ucry_06.pdf http://www.tandf.co.uk/journals/pdf/papers/ucry_06.pdf from 10 years ago, which say that in about 6 weeks, "a total of ten breaks were achieved". The WP page also refers to https://enigma.hoerenberg.com/index.php?cat=M4%2520Project%25202006&page=Rasch%2520Message https://enigma.hoerenberg.com/index.php?cat=M4%2520Project%2... , which took 10 years to decrypt (calendar time, not CPU time). See https://enigma.hoerenberg.com/cms/download.php?cat=65_M4%20Project%202006&file=Breaking%20the%20Last%20HMS%20Hurricane%20Intercept.pdf https://enigma.hoerenberg.com/cms/download.php?cat=65_M4%20P... for details.