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Category Archives: Modern Cryptography
Using Spruchnummer to crack Lorenz
Before reading further, you may like to read earlier articles on XOR and the Spruchnummer error. In sending the Lorenz cipher, one German operator used the same settings to send two identical messages, or rather, near identical messages. One began ‘Spruchnummer’ and the other began ‘Spruchnr’ and continued on. The allies realised that these two [...]
This post is part of a series of 46 posts which begins with The Caesar Shift, the latest post in the series is Letter Groups.
More fun with XOR
In order to discuss how the ‘Spruchnummer’ mistake lead the the Lorenz being broken, and why we must never reuse a one time pad key, we must first understand a little more about the nature of the XOR operation. XOR is essentially a ‘bitwise’ operation, i.e. it operates on signal bits at a time. I’ve [...]
This post is part of a series of 46 posts which begins with The Caesar Shift, the latest post in the series is Letter Groups.
A Mistake with Lorenz
This is an article which discusses the mistake made by a German operator when using the Lorenz Cipher.
This post is part of a series of 46 posts which begins with The Caesar Shift, the latest post in the series is Letter Groups.
Quantum Cryptography
There have been several news items this morning about Quantum Cryptography – I plan articles on this in the future. Japancorp reports that a quantum cryptography system has sent a key over 40km of fibre optics. This is a new record. Converge Digest confirm this story, as do Asia One in a readable article.
This post is part of a series of 46 posts which begins with The Caesar Shift, the latest post in the series is Letter Groups.
Venona
This post is part of a series of 46 posts which begins with The Caesar Shift, the latest post in the series is Letter Groups.