Gjøvik University College Cryptology 1

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shifrlash mashinasi Hegelin M-29

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• 3.3. Accessories

Table 1: Example setup sheet [Cryptomuseum]

When the internal settings are set, the operator set the start position on the key-wheels. This is called the external key, and is changed from message to message. This key is inserted into a prearranged position in the cipher text, which makes the deciphering operator set his machine to the correct start position.

3.3. Accessories
On the inside of the top lid, there is compartments for accessories, see Figure 6. At the center of the lid there is a paper tape holder, on the left side there is a screwdriver for opening the machine when setting the lugs and pins, a cylinder with blue or purple ink and one with oil. On the right side there is a pair of tweezers used for feeding the paper tape through the printer and removing blocked paper tape.



Figur 6:Accessories inside the M-209s lid

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