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== How does it work? == | == How does it work? == | ||
[[File:20 letters.jpg|400px]] | |||
The series of disks define 26 rows, each of 20 random letters. A message is encoded by rotating the disks one at a time so that one of the rows (and it does not matter which row) matches the text of the message. The ciphertext is then taken to be the letters read across any other row. | The series of disks define 26 rows, each of 20 random letters. A message is encoded by rotating the disks one at a time so that one of the rows (and it does not matter which row) matches the text of the message. The ciphertext is then taken to be the letters read across any other row. | ||