(very easy)
01/09/2005/06/21(easy)
22/09/2005/06/21
22/06/22(medium)
22/09/2023/06/22(medium)
22/09/2023/06/22(medium)
24/09/2023/06/22(difficult)
26/09/2023/06/22(difficult)
27/06/22(difficult)
(difficult)
Crypto Homepage --> Cipher Machines Challenge
The PURPLE cipher machine was put into service by japoneses in 1939. It was used by japonese embassies. PURPLE is the codename given by American's cryptanalists. In fact it genuine name is 97-shiki ohbun-injiki (System 97 Printing Machine) or Angoki Taipu-B (Type-B Cipher Machine). The PURPLE cipher replaced the RED Purple machine.
The RED system is not very secure, neither is the PURPLE machine. The main flaw of the two machine is the separate encryption of six letters (the SIXES). The PÜRPLE system was broken successfully by the American Army (SIS) in 1940.
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1st Problem (very easy) |
Rafael Pascual01/09/20 |
Garcia Larragan05/06/21 |
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2nd Problem (easy) |
Rafael Pascual22/09/20 |
Garcia Larragan05/06/21 |
G. Lasry22/06/22 |
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3rd Problem (medium) |
Rafael Pascual22/09/20 |
G. Lasry23/06/22 |
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4th Problem (medium) |
Rafael Pascual22/09/20 |
G. Lasry23/06/22 |
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5th Problem (medium) |
Rafael Pascual24/09/20 |
G. Lasry23/06/22 |
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6th Problem (difficult) |
Rafael Pascual26/09/20 |
G. Lasry23/06/22 |
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7th Problem (difficult) |
G. Lasry27/06/22 |
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8th Problem (difficult) |
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9th Problem (difficult) |
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