Pagrindinis šio darbo tikslas susipažinti su steganografijos mokslu bei statistiniais stegoanalizės metodais, kurių dėka slepiama ir atrandama informacija įvairiuose failuose. Šitame magistro darbe išnagrinėti, aprašyti bei įgyvendinti du steganografijos ir du stegoanalizės metodai. Visi metodai realizuoti JAVA programavimo kalba, daliai matematiniams skaičiavimams atlikti panaudota MAPLE programa. Darbo pabaigoje pateikta metodų analizė. / The main goal of the thesis is to review the methods of steganography and steganalysis and to experiment with them. Steganography helps to embed hidden messages in such way that anyone except the intended recipient is unaware of the existence of the message but with the use of statistical steganalysis methods those hidden messages can be detected. This thesis consists of two steganography (LSB and LSBH) and two steganalysis methods (RS and PoV) description and implementation. All methods were implemented with JAVA code. Thesis is concluded with a comparison of these methods' quality.