1. The Germans were convinced that the Tunny cipher system was unbreakable. 2. She developed a cipher system and often smuggled messages out of Richmond in hollow eggs. 3. Several times during the war D�nitz, considered the possibility of the Enigma cipher systems compromise. 4. "' Libelle "'is a German cipher system , developed by the Federal Office for Information Security. 5. :We learned that they had employed a Polish cipher expert to revise their code and cipher systems . 6. The cipher system used by the Soviets to disguise the messages'content was an extremely complex double-encrypted scheme. 7. The cipher system was continued in use. 8. Today this notation is relatively rare, and has been replaced by kepatihan notation, which is a cipher system . 9. Like any other cipher system , breaking a pseudo-random number system just requires a sufficient amount of intercepted ciphertext. 10. He was a leading codebreaker and linguist, who worked on the Lorenz cipher system Hitler's most top-level code.