A method of collaboration between protecting services associated with one or more domains. Such a method includes: getting a first agent used by a first protecting service to identify an attack on at least one resource managed by a domain protected by the first protecting service; and transmitting, to at least one second agent used by a second protecting service having taken out a subscription to at least one information-sharing service offered by the first protecting service, at least one piece of information relating to the attack identified by the first agent.