What factor about the Sobig virus made it most intriguing to security experts?

What class would the IP address of 193.44.34.12 be?

IDS is

What does HTTP mean?

One of the most widely known examples of ransomeware is the infamous …, first discovered in 2013.

The ... attack essentially realizes that the hash cannot be reversed; rather than trying to find out what the password is, the attacker just sends over the hash. If the attacker can obtain a valid username and user password hashes values (just the hash—the attacker does not know the actual password), then the hacker can use that hash, without ever knowing the actual password.

Which layer of the OSI model is divided into two sublayers?