Özet:

Nowadays, with the advancement of technology, information security has become quite important. Encryption and steganography techniques are used to ensure the security of data in the digital environment. The message is changed by encryption, by certain methods, as the receiver knows. Caesar, like the primary encryption techniques like Vigenere, also has modern encryption methods such as DES (Data Encryption Standard, Data Encryption Standard) and AES (Advanced Encryption Standard, Advanced Encryption Standard). But because the message will be hidden with steganography, it is enough to encrypt Vigenere from the original encryption methods. In Vigerene encryption, the message is collected through a key and the encrypted message is obtained. Steganography is about hiding the presence of the message. The encrypted text can be hidden in the text, image or sound with steganography. The content of the message is translated into the ASCII code. This code directory is collected with the ASCII responses of a key with the Vigenere encryption method. It is then intended to increase security by making different encryption depending on the unit and farming situation. The size of the encrypted data is hidden in the first line of the image, and the message is hidden in the blue component of the pixels in the line of the image, in the column or in the corner by LSB (The Most Important Bit) method. The change in the blue color component of the pixels is the most difficult change that the eye can perceive. As the changes will be the smallest value bid, it will be very difficult to perceive the difference with the original image. The message changed by encrypting has increased security by hiding with steganography and the message has been hidden twice.

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