Keyphrases
- electronic commerce
- transaction costs
- trusted third party
- third party
- online marketplaces
- lightweight
- seller agents
- authentication protocol
- digital images
- watermarking scheme
- cryptographic protocols
- communication protocol
- image authentication
- software agents
- watermarking algorithm
- spread spectrum
- network analysis
- security services
- business models
- security analysis
- online auctions
- tcp ip
- network structure
- fragile watermarking