Technical requirements for a breach archive and search service:
Storage: Breach databases can be large - from a few MB to several GB each. A comprehensive archive of major breaches may require 500GB-2TB of storage. NVMe SSD for fast search indexing.
Search engine: ElasticSearch for email address and username search across billions of breach records. Deployed on dedicated hardware for performance at scale.
Rate limiting: Prevent bulk extraction by limiting searches per IP and requiring email verification for full breach information. This is both ethical and prevents your service from becoming a data mining tool.
Privacy protection: Partial masking of sensitive fields (show only first 3 characters of password hash, partial email display) balances public notification value with preventing misuse.