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Building Mathematical ability S. Chand Publisher

There are times when we do not want others to be privy to our mails or messages. There are data that need to be kept as secret. For example your bank account number, your ATM pin, your credit card number and so on. Just think as to how much data a bank needs to store for its customer! And if each customer data has to be coded secretly what a huge work it would be. Do you think it could be a good idea to have a secret symbol for every alphabet as in the story Adventure of the dancing men? Why do you think Zimmermann used numbers in his telegram?