A new digital signature based method for image authentication and pixel-wise tamper localization is proposed. The proposed method is resistant to image content preserving enhancement operations such as blurring or sharpening. Authentication function is implemented separately from tamper localization both to increase processing speed and to disable algorithmic oracle attack. Ill. 7, bibl. 9 (in English; summaries in English, Russian and Lithuanian).Lietuviška santrauka. Aprašomas naujas skaitmeninio parašo metodas, skirtas atvaizdo autentiškumui patikrinti ir potencialiems vaizdo pažeidimams lokalizuoti vieno pikselio tikslumu. Siūlomas metodas yra atsparus atvaizdo esmės neiškraipantiems pakeitimams, tokiems kaip ryškumo ar miglotumo didini...