基于半脆弱水印的离线电子支付方案的研究与实现

结合半脆弱水印、信息隐藏和椭圆曲线密码体制,提出了一种比较完善的安全加密协议.该协议通过直接修改MP3Stego软件包实现信息隐藏,将通信双方的重要数据隐藏于表面上毫无相干的普通多媒体文件中;采用椭圆曲线密码体制使其具有更高的加密强度;嵌入的数字水印不仅对篡改具有高度的敏感性还能抵抗JPEG压缩.基于该协议构造了一种安全的离线电子支付方案,它使合法用户做到了完全的匿名,又能防止重复消费,可以较好地模拟传统现金的直接交易功能,是对现有电子支付模式的有效扩展和补充.

Research on off-line electronic payment scheme based on semi-fragile watermarking

Integrating semi-fragile watermarking,steganographia and elliptic curve cryptosystem,a more secure encryption protocol is introduced in the paper.The protocol realizes the steganographia through directly revising the MP3Stego software package.The protocol hides the important message from the sender and the receiver in multimedia files which are not correlative.Because of introducing the elliptic curve cryptosystem,the protocol has more secure intensity.The embedded watermarking is sensitive to distortion and can withstand JPEG compression.A secure scheme for off-line electronic payment is proposed by using the protocol.It can fully make the legal user anonymous,and effectively avoid continuous consumption.It has the explicit and direct function as traditional cash.And it is an effective extension and supplement to the present electronic payment patterns.