Legal and news term for the crime of stealing someone's personal information to impersonate them. Often used in formal or media contexts.
See also: 個人情報盗難 (こじんじょうほうとうなん)
The police warned that cases of identity theft are increasing.
To protect yourself from identity theft, it is important to change your passwords regularly.
Similar meaning, but 盗難 implies theft of physical items or data, while 窃盗 is a legal term for larceny. 個人情報窃盗 is the more established term for identity theft.
Compound of 個人情報 (personal information) and 窃盗 (theft, larceny). A modern term likely calqued from English 'identity theft'.