| ❌ Never Cache | ✅ Safe to Cache | |
|---|---|---|
| Passwords or authentication credentials | Session tokens (short TTL, encrypted) | Public content (blog posts, marketing pages) |
| Credit card numbers or payment details | User profile data (non-sensitive fields only) | Computed aggregations (analytics, summaries) |
| Unencrypted sensitive personal data (medical, financial, IDs) | Authorization claims (short TTL, validate critical ops) | Reference data (country lists, categories) |
| API keys and secrets | Static assets (images, CSS, JS) |
abhiknowswhy
/ blogpost_cache_security_guide.md
Created
November 1, 2025 18:51
abhiknowswhy
/ blogpost_cache_usage_guide.md
Last active
November 1, 2025 18:41
| Your Situation | Read-Write Pattern | Recommended Strategy |
|---|---|---|
| General web app, standard CRUD | High Reads, Moderate Writes | Cache-Aside + LRU + Write-Around |
| Financial transactions | Moderate Reads, High Writes | Write-Through + TTL + No cache on critical data |
| Social media feed | High Reads, Low Writes | Read-Through + Refresh-Ahead + LRU |
| Session storage | High Reads, Moderate Writes | Cache-Aside + TTL (30 min) |
| Product catalog (rarely changes) | High Reads, Low Writes | Read-Through + LRU + Long TTL (24h) |
| Real-time analytics dashboard | High Reads, High Writes | Refresh-Ahead + Short TTL (30s) |
| CDN/Static assets | High Reads, No Writes | Cache-Aside + LRU + Long TTL (7d) |
| Gaming leaderboards | High Reads, High Writes | Write-Behind + LFU + Short TTL |
abhiknowswhy
/ blogpost_cache_read_strategies.md
Created
November 1, 2025 17:57
| Strategy | Read Speed (Cache Hit) | Read Speed (Cache Miss) | Complexity | Best Use Case |
|---|---|---|---|---|
| Cache-Aside | Fast | Slow (3 round trips) | Low | General purpose, application controls caching |
| Read-Through | Fast | Moderate (2 round trips) | Medium | Read-heavy apps, CDNs, social feeds |
| Refresh-Ahead | Fast | Fast (proactive refresh) | High | Predictable access patterns, low latency needs |
abhiknowswhy
/ blogpost_cache_write_strategies.md
Created
October 28, 2025 18:20
| Strategy | Write Speed | Read Speed (After Write) | Data Consistency | Best Use Case |
|---|---|---|---|---|
| Write-Through | Slow | Fast | High | Financial transactions, critical systems |
| Write-Back | Fast | Fast | Risky (potential data loss) | Performance-sensitive applications |
| Write-Around | Moderate | Slow | High | Write-heavy, infrequent reads |
abhiknowswhy
/ blogpost_protectagainstrainbowtableattack_salt.md
Last active
October 24, 2025 18:03
| User Id | Password | Salt | Hashed Value | comment |
|---|---|---|---|---|
| John Doe | password123 | XyZ9mK | a1bfae8c49b7c3d4f4c (hash of password123XyZ9mK) | popular password |
| Jane Smith | 123456 | AbC3dE | f4g5h6i7j8k9l0m1n2o (hash of 123456AbC3dE) | common password |
| Bob Johnson | bobjohn@4518 | nfu9D3 | d8578edf8458ce06fbc (hash of bobjohn@4518nfu9D3) | rare password |
| attacker1 | password123 | jHfip9 | ajfhlkjafjahgiahrei (hash of password123jHfip9) | same password as John Doe, but different hash |
abhiknowswhy
/ blogpost_rainbowtableattack.md
Created
October 24, 2025 17:59
| User Id | Password | Hashed Value | Comment |
|---|---|---|---|
| John Doe | password123 | ef92b778ba5c3c9d4f4c8e5f8b6c3e5d7e6f7 | popular password |
| Jane Smith | 123456 | 8d969eef6ecad3c29a3a629280e686cff8ca4 | common password |
| Bob Johnson | bobjohn@4518 | d8578edf8458ce06fbc5bb76a58c5ca4 | rare password |
| attacker1 | password123 | ef92b778ba5c3c9d4f4c8e5f8b6c3e5d7e6f7 | matched hash with John Doe |
| attacker2 | 123456 | 8d969eef6ecad3c29a3a629280e686cff8ca4 | matched hash with Jane Smith |
abhiknowswhy
/ blogpost_hashedpassword.md
Created
October 24, 2025 17:55
| Password | Hashed Value |
|---|---|
| password123 | ef92b778ba5c3c9d4f4c8e5f8b6c3e5d7e6f7 |
| 123456 | 8d969eef6ecad3c29a3a629280e686cff8ca4 |