You have compromised a server on a network and successfully opened a shell. You aimed to identify all operating systems running on the network. However, as you attempt to fingerprint all machines in the network using the nmap syntax below, it is not going through.
invictus@victim_server.~$ nmap -T4 -O 10.10.0.0/24 TCP/IP fingerprinting (for OS scan) xxxxxxx xxxxxx xxxxxxxxx. QUITTING!
What seems to be wrong?

In the field of cryptanalysis, what is meant by a "rubber-hose" attack?

Which attack best demonstrates covert eavesdropping via smartphone sensors?

An enterprise logistics company in Nashville, Tennessee recently rolled out an automation update across its internal administrative systems. Within days, performance monitoring tools began reporting sporadic spikes in outbound connections and short-lived execution chains tied to a built- in scripting utility.
Security teams conducted full disk scans and integrity checks but found no unfamiliar executables or altered application binaries. Closer inspection of live system activity revealed that encoded command sequences were being executed within trusted system processes. The activity ceased after a restart but reappeared when similar administrative actions were triggered.
Identify the malware category that best aligns with this operational pattern.

In Trojan terminology, what is a covert channel?