Java applet code review

Attackers Reverse Engineer Client

1. All clients can be reverse engineered, monitored, and modified
2. All encryption keys and mechanisms are not secrets
3. All intellectual property (algorithms, data) is disclosed

Attackers Create Malicious Client, Server, or Proxy

1. Tamper with requests and responses
2. Spoof a legitimate client or server application

Attackers Target Rich Client Application Itself

1. Clients can be abused - especially if they are "listening"
2. All forms of input corruption (injection, overflow, etc.) can be used
3. Spoofed server can be set up

Attackers Target Server Application Vulnerabilities

1. All typical server application issues are possible. See Java_server_(J2EE)_code_review

Client Security Considerations

1. Mutual authentication over SSL
2. Access control is not possible on client
3. Input validation
4. Interpreter use
5. Error handling and logging
6. Intrusion detection
7. Encryption
8. Protecting information is not possible on client
9. For secure communications
10. For secure storage
11. Jar Signing