Cyber war is just a "matter of time": Iran is functional "offline", unlike the USA

Deutsche Welle asked security experts: What would be the strength of Iran in such a cyber war?
The day after the US drone attack killed Iranian General Qasim Soleimani, the US Department of Homeland Security issued a warning against possible cyber-attacks by Iran and its proxies.
"Iran maintains a robust cyberprogram and can execute cyberattacks against the United States," the advisory read. "Iran is capable, at a minimum, of carrying out attacks with temporary disruptive effects against critical infrastructure in the United States." The authorities asked citizens to be prepared for "cyberdisruptions, suspicious emails, and network delays."

Cyber war is just a "matter of time"

Within hours after the warning was issued, a federal government's website was hacked by allegedly Iran-affiliated hackers: they altered the photo of President Donald Trump to look like he was being punched in the face and also paid tribute to the murdered Soleimani.
"Hacked by Iran Cyber Security Group Hackers. This is only small part of Iran's cyber ability! We are always ready," the hackers signed off.
It's not yet known if the hackers were affiliated with Tehran, but the attack on the nondescript US website was consistent with similar intrusions in the past by Iranian hackers. Iran has vowed "forceful revenge" in the aftermath of the killing of Soleimani and cyberwarfare is expected to be a major component of that retaliation. Could the attack of the hackers be a continuation of retaliation?
"I don't think Iran would use cyberattacks as the primary mechanism for revenge but as part of the wider revenge package," Philip Ingram, a former British military intelligence officer, told DW. "It's not if, it's definitely when".

Sophisticated...