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

What does HTTP mean?

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.

What class would the IP address of 193.44.34.12 be?

Likewise, ......DoS attacks use much more sophisticated methods.

What kind of cable has 40Gbps speed?

What is SAM?