一种新的无第三方参与的买方卖方水印协议

A new buyer-seller watermarking protocol without the third party

提出了一种新的无第三方参与的买方卖方水印协议。该协议利用秘密共享和同态公钥密码体制思想,买方和卖方各随机产生部分秘密,交易时由卖方在加密的状态下将两个秘密合成一个秘密,并作为水印内容嵌入数字产品。该水印协议能很好地解决盗版追踪、消费者权益保护等问题,同时,由于没有第三方的参与,可以完全避免共谋问题的发生。

A new buyer-seller watermarking protocol without the third party was proposed, which used the idea of secret sharing and homomorphie public key cryptosystem. For a transaction, a piece of secret was produced by the buyer and the seller respectively, and the two pieces of secret were mixed into one secret in encrypted domain, which was embedded in a digital product as a watermark. The pirate tracing problem, the customer＇s problem and other problems can be solved by this watermark protocol. Meanwhile, the conspiracy problem can be completely avoided because of no the third party.