Digittrade HS256S User Manual page 83

3) Using limited amount of storage devices for a wide range of customers
If a company (i.e. data processing company or data center for large companies or
agencies) is in a constant exchange of data with many different data recipients, it
can use the benefits of the HS256S to transport data secure and cost-efficient. Every
recipient receives a smart card with his/her own cryptographic key. The dispatcher
has a copy of each of the cards with the cryptographic key of every recipient.
For the transportation of data a smart card with the cryptographic key of the recipi-
ent is initialised with the HS256S (device PIN required).
Every HS256S is suitable. Subsequently, the data dispatcher does a quick format of
the HS256S with the new cryptographic key which only takes a few minutes. Com-
plicated data deletion or overwriting is not necessary, as the data was encrypted with
a different cryptographic key and could only be encrypted and restored by the owner
of the old cryptographic key provided the data has not already been overwritten.
If data is supposed to be sent to the same recipient in short intervals then there is no
need to wait for a personalized HS256S to return. Every HS256S can be used all you
need to do is initialize it with the recipients cryptographic key.
The amount can be reduced to the actual amount needed at one time, as not every
recipient needs their own HS256S. It is irrelevant which of the company's HS256S is
available and used for transport. It is crucial with which cryptographic key the data
is written to the HS256S.
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