Greg Mefford wrote:
> take some input text or a file on my computer and have the card
> encrypt it

Cards are really slow, so generally encryption is done by the PC
using symmetric encryption (e.g. AES) and the card is then used to
asymmetrically encrypt the AES key.

Decryption is the reverse; card is used to decrypt the AES key, then
the PC decrypts the data.

It's a performance vs. security tradeoff, so if you have high
security requirements alternatively low data volume, you can also use
the card for all data without much negative impact.


//Peter
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