The men now rising through the security establishment have spent their careers confronting enemies abroad and suppressing dissent at home. The announcement of the senior appointments, purportedly made by Supreme Leader Mojtaba Khamenei on Monday, followed the naming of a new national security chief, Mohsen Rezaie, a day earlier. Most of the appointees have a background in intelligence, according to Saeid Golkar, associate professor of political science at the University of Tennessee at Chattanooga. “The current leadership in Tehran is far more risk-taking,” according to Vali Nasr, author of “Iran’s Grand Strategy.” Given his long absence from public view, analysts are unsure whether Khamanei is indeed the architect of the new set-up.