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Substitution Transposed

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456 has 14 factors.


The two methods used to encrypt the message are commutable, so it doesn't matter which method you decipher first.

 

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Substitution Cipher

Find the frequency distribution for ordinary English, and use it to help you crack the code.

Secret Transmissions

How can Agent X transmit data on a faulty line and be sure that her message will get through?

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The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice.

NRICH is part of the family of activities in the Millennium Mathematics Project.

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