Determining race condition in protocol

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Reference no: EM1351353

Q1) What is thr race condition in this protocol?

1-insert debit card into debit machine
2-debitcard machine determine current value of card in dollars which is stored in value x
3-user insert dollars into debit card machine ,and the value of inserted dollars vstored in value y
4-user press enter
5- machine write value x+y

where is race condition? how an attack might exploite it? how to modify this protocol to prevent or make race condition difficult.

Reference no: EM1351353

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