Considering information security, reversible data hiding methods provide an efficient and simple way to prevent illegal accessing and unauthorized tampering. Adopting converted techniques, original images are going to be transferred to a collection of coefficients to be altered for embedding secret message. Then, the coefficients are converted to stego-images inversely. And stego-images are able to be a cover image to embed secrete message at the next stage. The horizontal operation of Haar digital wavelet transformation transfers images format from spatial domain to frequency domain in this paper. Then, decimal of coefficients will be altered for hiding secret bits. Finally, the modified coefficients are inversely transformed to stego-images. Our scheme has high peak signal to noise ratio (PSNR) when bits per pixel are near one bit. In this paper, we are concerned about data hiding for a special kind of image.

Following the White Paper HCE that Google released in August 2014, it was expected that NFC mobile phone payment would cause a wave of security discussion. After all, Android HCE will allow anyone to develop his own payment service on the Android platform to get rid of restriction from telecommunications, financial industries, or third party trust centers. On this security mechanism observation period, we propose a lightweight authentication protocol on NFC mobile sensors payment. Through introducing this security agreement, it not only allows individuals to have privacy protected, but also can prevent malicious attackers from the track, which will make legitimate Tags verified, while effectively preventing an illegal Tag from being forged as an authenticated Tag. Therefore, constructing full security mechanisms will benefit to the development of mobile NFC payment.

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