Ancient ciphers remain unsolved due to the specialized skills required. A web app could combine known decryption methods with machine learning to suggest possible solutions.
The tool would guide users through cipher analysis with visualizations of pattern matches and statistical approaches. Academic institutions might pay for premium features that support collaborative research.
Start with just 2-3 cipher types and basic frequency analysis. The biggest risk is limited market size - most users would be one-time visitors rather than subscribers.