The passive attack on computer security is
The passive attack on computer security is Masquerade
In a masquerade attack, the intruder pretends to be a particular user of a system to gain access or to gain greater privileges than they are authorized for. ... Active attacks contrast with passive attacks, in which an unauthorized party monitors networks and sometimes scans for open ports and vulnerabilities.
A passive attack is a network attack in which a system is monitored and sometimes scanned for open ports and vulnerabilities. The purpose is solely to gain information about the target and no data is changed on the target. Passive attacks include active reconnaissance and passive reconnaissance.
The active attack includes modification of the message. On the other hand, in passive attacks, the attacker doesn't commit any changes to the intercepted information. ... In contrast, an active attack is a threat to the integrity and availability of the data.