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Quantum Security Scanner

Your password will be cracked by quantum.

Quantum computers will break most passwords in seconds — not years. See exactly how long yours survives, and what to do about it. Free, instant, nothing stored.

Never transmitted Browser-only analysis No account needed 100% free
◆ Enter your password
CriticalWeakFairStrongQuantum-Safe
◆ Analyzed locally — your password never leaves this page
💻 Classical computer
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10 billion guesses/sec
Modern GPU brute-force
⚛️ Quantum computer
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Grover's algorithm
Quadratic speedup attack
⚛️
Quantum Status
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Overall security rating
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◆ Security checklist
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2031
Est. year quantum breaks RSA-2048
√N
Grover's algorithm speedup
6B+
Passwords leaked in 2024
20+
Chars for quantum resistance
The Quantum Threat

Why quantum computers change everything

01
What is Grover's Algorithm?
Quantum computers use Grover's algorithm to search through possible passwords. Unlike classical computers that try one at a time, quantum machines effectively try all combinations simultaneously — cutting the time to crack your password from trillions of years to just years, days, or seconds depending on length.
02
The square root problem
Grover's algorithm gives quantum computers a "quadratic speedup" — meaning if your password has N possible combinations, a quantum computer only needs √N attempts instead of N. An 8-character password with 200 trillion combinations? A quantum machine needs only ~14 million attempts.
03
When does this become real?
Experts estimate cryptographically relevant quantum computers arrive between 2030–2035. But the threat is already real today — bad actors are harvesting encrypted data now to decrypt later with quantum machines. This is called "harvest now, decrypt later."
04
How to be quantum-safe
The defense is simple: longer passwords. Grover's algorithm halves the effective security bits, so you need twice as many. A 128-bit classical password needs to become 256-bit for quantum safety. In practice: use 20+ character passwords with full character variety.
05
Passphrases are your best weapon
A passphrase like "correct-horse-battery-staple-mountain" is long, memorable, and quantum-resistant. Its sheer length creates enough entropy to survive even quantum attacks. Combine with a password manager and you're set for the quantum era.
06
Two-factor auth still matters
Even quantum computers can't bypass a one-time code sent to your phone. 2FA is a crucial second layer that makes your accounts quantum-resistant regardless of password strength. Always enable it on email, banking, and social accounts.
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Password Tips

How to build a quantum-strong password

📏
Go longer — much longer
For quantum safety you need 20+ characters. Each extra character doesn't just add to crack time — it multiplies it. A 20-char password takes a quantum computer billions of times longer than a 12-char one.
🎲
Use random passphrases
Four or five random words strung together ("lamp-ocean-silver-chair-fork") give you length, memorability, and quantum resistance all at once. Far better than short complex passwords.
🔑
Use a password manager
Bitwarden (free), 1Password, or Dashlane generate 20+ character random passwords for every site. You only remember one master password. This is the gold standard for the quantum era.
♻️
Never reuse passwords
One leaked password from any site can unlock everything if reused. With quantum attacks on the horizon, the damage multiplies. Every account needs a unique, long password.
📱
Always use 2FA
Quantum computers can't intercept a one-time code sent to your phone. Two-factor authentication is your most powerful quantum-resistant layer, regardless of password strength.
🚫
Avoid personal information
Names, birthdays, pets, and city names drastically shrink the search space for attackers. Quantum-era attacks will try personal info patterns first — never include them.
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FAQ

Common questions

Is my password sent to your servers? ▼
No. QPasswordStrong runs entirely in your browser using JavaScript. Your password is never transmitted, logged, or stored anywhere. You can disconnect from the internet and it still works perfectly.
How is the quantum crack time calculated? ▼
We use Grover's algorithm as the model for quantum attacks. Grover's provides a quadratic speedup — effectively halving the number of security bits in your password. So we calculate your password's entropy, halve it to simulate Grover's advantage, then estimate crack time at realistic quantum computing speeds.
When will quantum computers actually be a threat? ▼
Most experts estimate cryptographically relevant quantum computers will emerge between 2030 and 2035. However, the "harvest now, decrypt later" threat is already real — adversaries are storing encrypted data today to crack with quantum machines in the future. Building quantum-strong habits now is the smart move.
What makes a password quantum-safe? ▼
Because Grover's algorithm halves effective security bits, you need roughly double the entropy for quantum safety compared to classical safety. In practical terms this means 20+ characters with a mix of uppercase, lowercase, numbers, and symbols — or a long random passphrase of 5+ words.
Why does my complex short password still score low? ▼
Length is far more important than complexity. An 8-character password with symbols has far less entropy than a 20-character lowercase passphrase. Common tricks like replacing 'e' with '3' or 'a' with '@' are well known to attackers and add almost nothing against quantum-speed attacks.
What password manager do you recommend? ▼
Bitwarden is free, open-source, and excellent. It generates truly random 20+ character passwords for every site and stores them securely. 1Password and Dashlane are great paid alternatives. All three will keep you quantum-ready without needing to remember anything.
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