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There are many settings in which sensitive information is made available to a system or organisation for a specific purpose, on the understanding that it will be erased once that purpose has been fulfilled. A familiar example is that of online credit card transactions: a customer typically provides credit card details to a payment system on the understanding that the following promises are kept: NonInterference (NI): the card details may flow to the bank (in order that the payment can be authorised) but not to other users of the system; Erasure: the payment system will not retain any record of the card details once the transaction is complete.
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