Security Considerations

# Security Considerations ## Privacy Assumptions Self Connect's privacy model assumes: 1. **ODIS Operators:** At least k operators remain honest 2. **Rate Limiting:** Quota system prevents mass scraping 3. **Blinding:** Client-side blinding is implemented correctly 4. **No Collusion:** Attackers don't control k or more ODIS operators **If Assumptions Hold:** * Identifiers cannot be reverse-engineered from blockchain data * Rainbow table attacks are prohibitively expensive * User privacy is preserved **If Assumptions Fail:** * If k operators are compromised: Peppers for any identifier can be computed * If rate limiting is bypassed: Rainbow tables become feasible ## Sybil Resistance Self Connect provides Sybil resistance through: 1. **Verification Requirements:** Users must prove ownership of identifiers 2. **Issuer Quality:** Applications choose issuers with strong verification 3. **Costly Registration:** ODIS quota costs make mass fake registrations expensive 4. **Unique Identifiers:** Phone numbers and verified social accounts are limited per person **Limitations:** * Relies on issuer verification quality * Some identifiers (email) are easier to create in bulk * Applications must choose issuers carefully ## Comparison: ASv1 vs. Self Connect | Aspect | ASv1 | Self Connect | | ------------------------- | --------------------------------- | ---------------------------- | | **Verification** | 3 randomly selected validators | Issuer (flexible method) | | **Trust Model** | Single root: Validator collective | Multiple roots: Each issuer | | **Verification Quality** | Standardized across network | Varies by issuer | | **Flexibility** | Phone numbers only | Any identifier type | | **Censorship Resistance** | Validator majority | Multi-issuer selection | | **Scalability** | Limited by validator overhead | Scales with issuer ecosystem | ## Best Practices 1. **Choose Trusted Issuers** * Evaluate verification methods * Check issuer reputation * Monitor issuer behavior 2. **Implement Rate Limiting** * Limit lookup frequency per user * Monitor for abnormal query patterns 3. **Validate Results** * Check timestamps for recency * Verify issuer addresses * Handle multiple attestations appropriately 4. **Secure Key Management** * Protect issuer private keys * Use hardware security modules for production * Implement key rotation procedures 5. **Monitor ODIS Quota** * Set up alerts for low quota * Implement automatic top-ups * Track quota usage patterns