Tạo Chỉ Chữ

📋 When to Use Letters-Only Passwords

Only uppercase and lowercase letters — no digits or symbols. Some systems have bizarre password policies that reject numbers (yes, they exist). Also useful for generating human-readable identifiers for non-security purposes like project codes or reference numbers that should be pronounceable.

📊 Phan Tich Ky Thuat — letters-only

• Entropy: 91 bits at 16 chars
• Crack time: ~250 billion years
• Security level: Strong
• Tot Nhat Cho: Accessibility, systems blocking digits

All calculations assume letters-only with mixed character types. Actual security depends on specific character selection.