DE4A Evidence Service Locator (ESL)

DE4A Evidence Service Locator (ESL) helps the DC to locate the evidence service able to provide a canonical evidence from a particular competent issuing authority, along with the relevant evidence service characteristics.

For such a task, ESL requires the following preconditions:

1. DC knows the canonical evidence type to request and the corresponding issuing authority level after consulting the IAL.

1. Every issuing authority registered in the ESL their services to provide the canonical evidence types along with the relevant service characteristics.

1. Each evidence service has a unique identifier and provides data for a canonical evidence type issued by an issuing authority according to the IAL provisions.

Therefore, the DC first locates the proper provision in the IAL regarding to the corresponding canonical evidence type and administrative level for issuing the required evidence, and then consults the ESL for the evidence service corresponding to the located IAL provision metadata with the following possible consultation flow:

A.     Evidence Service Location (Main flow 1): DC asks for the evidence service for a canonical evidence type and issuing authority identifiers.

• R1 (Success): metadata of evidence service (e.g. input parameters, SLA, constraints if any, attached legal evidences, etc.) and connection details.

• R3 (Error): there is no available evidence service that corresponds to the given canonical evidence type and issuing authority identifiers.

ESL is an adapted version of TOOP DSD and uses the SMP service Metadata and ttension "SMP Business Cards".