Multiple Schemes for Bike-Share Service Authentication Using QR Code and Visual Cryptography

With the growing application of quick response (QR) code on bike-share service, there is the possibility of tampering and replacing the QR code. Thus the security of the personal information and the property are fragile. To solve the problem, we propose the multiple QR code authentication schemes for bike-share service. The hierarchy visual cryptography system (HVCS) is combined with the error correction of QR code in Scheme I. Firstly, the secret image for authentication is encrypted into two shared images (referred to as shadows) according to improved (2, 2)-PVCS. Secondly, one of the shadows is stored in cloud server and the another shadow is encrypted into n sub-shadows based on probability. Then these sub-shadows are fused with QR codes to get the security QR codes which are posted on bikes. Finally, when users scan the security QR codes (shadows) by smartphone, the shadow stored in cloud server is downloaded and stack with the scanned QR code to decode the secret image for QR code authentication. Scheme II is a method of adapting multiply secret images for batter visual effect. The multi-secret visual cryptography system (MVCS) and the XOR mechanism of RS with Positives Basis Vector Matrix (PBVM) are combined. Firstly, a random grid is generated as the special shadow in cloud server. Secondly a series of shadows is generated according to the MVCS. Then these shadows are fused with QR code by XOR mechanism of RS code to obtain the security QR codes. Finally, secret images are decoded by stacking the special shadow and security QR codes. Experimental results show that our methods has great capacity and high security.