Abstract: Aspects of the subject disclosure provide a reader device for managing transactions using financial instruments with encrypted data storage devices, such as integrated circuit cards (ICC). In some implementations, a reader device of the subject technology can be configured to access the encrypted information in an ICC via an index or table of keys stored on a host device. In operation, upon detecting an ICC, the reader device can obtain application or protocol information for the ICC and concurrently pre-fetch keys from the host device, so that the pre-fetched keys are received prior to or concurrently with the application or protocol information. In the event that the pre-fetch fails to provide the keys needed for the application or protocol of the ICC, the reader device can make a specific request for the exact keys needed for the application or protocol.

Abstract: Aspects of the subject disclosure provide a reader device for managing transactions using financial instruments with encrypted data storage devices, such as integrated circuit cards (ICC). In some implementations, a reader device of the subject technology can be configured to access the encrypted information in an ICC via an index or table of keys stored on a host device. In operation, upon detecting an ICC, the reader device can obtain application or protocol information for the ICC and concurrently pre-fetch keys from the host device, so that the pre-fetched keys are received prior to or concurrently with the application or protocol information. In the event that the pre-fetch fails to provide the keys needed for the application or protocol of the ICC, the reader device can make a specific request for the exact keys needed for the application or protocol.