Exploiting the Tiltman Break - Computerphile | Summary and Q&A

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September 5, 2018
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Exploiting the Tiltman Break - Computerphile

TL;DR

The Lorenz Cipher, also known as the Tunny machine, used teleprinter traffic encrypted with a Vernam Cipher for communication during World War II.

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Questions & Answers

Q: What was the purpose of the Tunny machine during WWII?

The Tunny machine was used by the Germans to send encrypted teleprinter traffic, using the Vernam Cipher, for secure communication during the war.

Q: How did Bletchley Park decrypt the Tunny machine messages?

Bletchley Park staff, led by Bill Tutte, discovered patterns in the encrypted messages that indicated the use of multiple cogs with prime number teeth. They were able to analyze and decipher the encryption using this information.

Q: How did the Germans try to obscure the encryption patterns?

The Germans used an additional set of wheels that sometimes moved and sometimes stayed still in an attempt to confuse the decryption efforts of the Allies.

Q: What impact did the use of the Indicator have on decrypting the Tunny machine messages?

The Indicator, which provided information about the initial wheel settings, helped the Allies decrypt the messages. However, the Germans eventually stopped using the Indicator, making it more challenging for the Allies to decipher the encryption.

Summary & Key Takeaways

  • The Tunny machine was used by the Germans to send teleprinter traffic encrypted with the Vernam Cipher during WWII.

  • Bletchley Park staff, including Bill Tutte, discovered patterns that indicated the use of multiple cogs with prime number teeth on the Tunny machine.

  • The Germans tried to obscure the patterns with an additional set of wheels, but the Allies were able to decipher the encryption.

  • The use of the Indicator to change wheel settings made it easier for the Allies to crack the encryption until the Germans stopped using it in mid-1942.

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