Keyphrases
- spam filtering
- biometric authentication
- user authentication
- fragile watermarking
- identity authentication
- instant messaging
- authentication protocol
- spam detection
- security analysis
- security mechanisms
- digital watermarking
- pre classified
- communication medium
- keystroke dynamics
- electronic mail
- anti spam
- feature extraction
- image authentication
- information systems
- text mining
- database
- security requirements
- integrity verification
- factor authentication
- information retrieval