(1)接收者能夠核實(shí)發(fā)送者對(duì)報(bào)文的簽名; (2)發(fā)送者事后不能抵賴對(duì)報(bào)文的簽名; (3)接收者不能偽造對(duì)報(bào)文的簽名。