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Kamm had taken about 2,000 military papers during her mandatory army service and passed classified information on to a correspondent for Israel's Haaretz daily.
The newspaper subsequently reported in 2008 that top army officers had authorised the assassination of Palestinian militants in a possible violation of Israeli law.
"She's a young woman who at the time believed she stumbled onto (evidence of) war crimes," Kamm's lawyer Avigdor Feldman told Army Radio.
Kamm will be sentenced later. The offences she pleaded guilty to carry a maximum jail term of 15 years under Israeli law.