Mexican army cipher disk belongs to monoalphabetic cipher, it uses two digits to represent one letter. Above picture shows that there are four different cipher rows to compile letter.
For example, if we like to cipher " College", it can be represented to:
17032626192119 or,
64762697196890 etc,
A plaintext letter can be represented by several symbols, but each symbol can only represent one letter. As a result, it is not at high level of security. But I think it is interesting.
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