Mainstream usage of "hacker" mostly refers to computer criminals, due to the mass media usage of the word since the 1990s.[5] This includes what hacker jargon calls script kiddies, less skilled criminals who rely on tools written by others with very little knowledge about the way they work.[6] This usage has become so predominant that the general public is largely unaware that different meanings exist.[7] Though the self-designation of hobbyists as hackers is generally acknowledged and accepted by computer security hackers, people from the programming subculture consider the computer intrusion related usage incorrect, and emphasize the difference between the two by calling security breakers "crackers" (analogous to a safecracker).