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πŸ” Technical Security Deep-Dive

How We Protect Your Secrets

Interactive SRP-6a flow illustration: your password never leaves your device.

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256-bit
Encryption
βš›οΈ
∞ years
Quantum Safe
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Audited
Open Source
🚫
0%
Server Access

Zero-Knowledge Architecture

Mathematical proof that we cannot access your data, even if we wanted to.

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Your Device

Data encrypted locally with your password. Keys never leave your browser.

Full Control
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Encrypted Transmission
πŸ–₯️

Our Servers

Only encrypted blobs. No keys, no access, no backdoors. Mathematically impossible to decrypt.

Zero Access
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Encrypted Retrieval
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Recipient

Decryption happens locally with the shared key. Server never involved in crypto operations.

Full Privacy

πŸ” SRP-6a Login Flow (Illustration)

  1. πŸ’»
    Client β†’ Server: A = gᡃ mod N
    No password ever leaves your device.
  2. πŸ–₯️
    Server β†’ Client: B = kΒ·v + gᡇ mod N
    Only public values exchanged.
  3. πŸ”
    Client (intern): K = H((B – kΒ·gΛ£)^(a + uΒ·x) mod N)
    Session key derived locally.
  4. πŸ“‘
    Client β†’ Server: M1 = H(…, A, B, K)
    Proof sent – still no password.
  5. βœ…
    Server β†’ Client: M2 = H(A, M1, K)
    Mutual authentication complete.
πŸš€ Starting SRP-6a login…
πŸ“‘ Requesting challenge…
β†’ A = 611dde12…
βœ… Challenge received
πŸ” Generating client proof…
β†’ M1 = 5f968510…
βœ… Proof sent (password never left your device)
πŸ“‘ Verifying server response…
βœ… Mutual authentication successful
πŸŽ‰ Login complete – your password was never transmitted
    

Military-Grade Cryptography Stack

The same algorithms protecting classified government communications.

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SRP-6a Authentication

Zero-Knowledge Protocol Password Never Transmitted NSA Suite B

Secure Remote Password protocol ensures your password never leaves your device. Even network traffic interception cannot reveal authentication credentials.

Technical Implementation:

  • 2048-bit safe prime modulus
  • SHA-256 hash function
  • Cryptographically secure random number generation
  • Protection against timing attacks
Military Grade
🧬

Argon2id Key Derivation

Memory-Hard Function ASIC-Resistant PHC Winner

Winner of the Password Hashing Competition. Memory-hard function that makes brute-force attacks computationally infeasible even with specialized hardware.

Technical Parameters:

  • Memory cost: 64 MB per operation
  • Time cost: 3 iterations minimum
  • Parallelism: 4 threads
  • 128-bit cryptographically secure salt
Quantum-Resistant
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XChaCha20-Poly1305

Authenticated Encryption 256-bit Keys IETF Standard

State-of-the-art authenticated encryption. Used by Signal, WireGuard, and TLS 1.3. Provides both confidentiality and authenticity with quantum-resistant properties.

Technical Specifications:

  • 256-bit encryption keys
  • 192-bit extended nonces
  • 128-bit authentication tags
  • Constant-time implementation
Unbreakable

Threat Model Analysis

Comprehensive protection against all known attack vectors.

🌐 Network Attacks

Man-in-the-Middle βœ“ Protected

End-to-end encryption + TLS 1.3

Traffic Interception βœ“ Protected

Client-side encryption before transmission

Replay Attacks βœ“ Protected

Cryptographic nonces + timestamps

πŸ–₯️ Server Attacks

Data Breach βœ“ Protected

Zero-knowledge architecture

Insider Threats βœ“ Protected

No employee access to user data

Server Compromise βœ“ Protected

Encrypted data without keys

πŸ” Cryptographic Attacks

Brute Force βœ“ Protected

256-bit entropy + Argon2id

Rainbow Tables βœ“ Protected

Memory-hard KDF + unique salts

Timing Attacks βœ“ Protected

Constant-time implementations

βš›οΈ Quantum Threats

Shor's Algorithm βœ“ Protected

No RSA/ECC dependencies

Grover's Algorithm βœ“ Protected

256-bit symmetric keys

Future Algorithms βœ“ Protected

Post-quantum ready architecture

Abuse Prevention Without Tracking

To prevent abuse and enforce fair usage, ZeroNote stores only cryptographically hashed IP addresses and device fingerprints. These hashes cannot be used to identify individuals and are never used for tracking or profiling. This enables effective rate limiting and anti-abuse protection, while maintaining zero-knowledge privacy for all users.

Security Audits & Transparency

Open source code, independent audits, and transparent security practices.

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Open Source

Complete source code available for inspection. No security through obscurity.

🎯

Penetration Testing

Regular security assessments by independent security researchers.

Next: Q3 2025
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Bug Bounty Program

Incentivizing security researchers to find and report vulnerabilities.

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Compliance Standards

Adherence to industry security standards and best practices.

GDPR

Responsible Disclosure

Found a security issue? We appreciate responsible disclosure and reward security researchers.

1

Report Privately

Send details to security@zeronote.de using our PGP key.

2

We Investigate

48-hour acknowledgment, thorough investigation within 7 days.

3

Fix & Reward

Issue fixed, researcher credited, bounty paid if applicable.

4

Public Disclosure

Coordinated public disclosure after fix deployment.

Security Contact

Security Email: security@zeronote.de
We respond within: 48 hours
Found a security bug? Report responsibly and get rewarded
πŸ” Advanced: Encrypted reporting (PGP)
PGP Fingerprint: EBA3 07F1 64F6 CFFD 0B38 3DBC DCC5 56E0 A0EA 30C7 For security researchers who want to encrypt their reports