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Type of cipher machine encryption

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nik_meback
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PostPosted: Mon Dec 20, 2010 11:46 am    Post subject: Type of cipher machine encryption Reply with quote

This question is maybe off topic w.r.t. modern crypto. Here it goes:

Just as Caesar Cipher is a monoalphabetic substitution cipher and vigenere cipher is a poyalphabetic substitution cipher, what category do the following cipher machines belong to i.e. what is the underling principle used en-/decrypt using the following machines:
(i.e. do they use substitution or transposition, monoalphabetic or polyalphabetic etc.)

- Enigma rotor machine (have heard that it is a polyalphabetic substitution, not sure)
- Typex rotor machine
- Sigaba rotor machine
- Lorenz
- Purple

Thanks.
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