@prefix skos:	<http://www.w3.org/2004/02/skos/core#> .
@prefix isac:	<http://webisa.webdatacommons.org/concept/> .
isac:_password_	skos:broader	isac:authentication_code_ .
isac:digital_signature_	skos:broader	isac:authentication_code_ .
isac:_mac_	skos:broader	isac:authentication_code_ .