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## Secure Cryptography in Privora – Local, In Transit, and Post-Quantum Ready

In a world where digital communication is increasingly monitored, analyzed, and stored, **Privora** deliberately takes a radically different path. Our cryptographic architecture is designed to offer not just immediate protection, but also long-term resilience – even in the face of future threats like quantum computing.

This article outlines how Privora secures communication on three levels: **local storage**, **peer-to-peer transmission**, and **forward-looking cryptography**.



### **1. Local Encryption**

All sensitive user data – including messages, contacts, settings, and cryptographic keys – is encrypted directly on the device using the well-established **AES-256** standard. The encryption key is derived locally from the user’s private access code and is never stored in plaintext or transmitted.

#### How secure is AES-256?

Let’s break it down:

*   Total possible keys:
    `2^256 ≈ 1.16 x 10^77`

*   Even with a theoretical supercomputer checking **10^18 keys per second**, brute-forcing AES-256 would take:
    **≈ 3.67 x 10^52 years**

That’s trillions of times longer than the universe has existed (\~13.8 billion years). In practice, **AES-256 is unbreakable by brute force**.



### **2. Transport Encryption via Tor**

Privora uses a hybrid encryption model for data transmission:

*   Each message is encrypted using a symmetric key, established via **Elliptic Curve Diffie-Hellman (ECDH)** using Curve25519.

*   All communication takes place over the **Tor network**, using Onion Services (hidden services).

*   This ensures that both the message content and the metadata – such as sender/receiver IP addresses – are anonymized and protected from surveillance.

#### How strong is ECDH over Curve25519?

*   This setup offers a 128-bit security level.

*   Brute-forcing a single key would still take **more than 10^30 years** with today’s computing power.



### **3. Planned Feature: Asynchronous Delivery**

Currently, Privora requires both peers to be online and reachable through Tor to exchange messages. In the future, we aim to support **asynchronous messaging**, where encrypted messages are stored **locally** and only sent once the recipient is available via Tor.

Importantly, this will be implemented **without any central server or cloud buffer**, keeping Privora fully decentralized and privacy-respecting.



### **4. Emergency Wipe Function**

Privora features a built-in **Emergency Code**. If entered, the app will immediately and irreversibly delete all encrypted data – including the AES master key and all locally stored content. Optional secure overwrite routines ensure no trace remains, even under forensic inspection.



### **5. Post-Quantum Cryptography (In Development)**

Quantum computers pose a serious threat to traditional encryption algorithms, especially RSA and ECDH. Privora is actively testing the integration of **Kyber**, a lattice-based encryption scheme selected by **NIST** as a post-quantum standard.

#### Example: How quantum computing affects encryption

*   A large enough quantum computer using **Shor’s algorithm** could break ECDH keys in **minutes to hours**.

*   AES is more resilient, but its effective strength is halved under **Grover’s algorithm** – AES-256 becomes roughly equivalent to AES-128, which is still considered secure.

By introducing Kyber, Privora prepares for a future where **quantum-resistant encryption is no longer optional, but essential**.



### **Conclusion**

At Privora, cryptography is not a feature – it’s the foundation. By combining:

*   full local encryption,

*   anonymous peer-to-peer transmission over Tor,

*   decentralized architecture,

*   emergency self-destruction features,

*   and post-quantum readiness,

Privora delivers a messaging platform that respects your privacy – not just today, but in the decades to come.


Beyond End-to-End: Cryptography That Defends Against Tomorrow’s Threats

Download Privora or Learn More About How It Works

Discover how Privora keeps your conversations private and secure – no central servers, no data mining. Download the app now or dive deeper into our blog to explore the technology behind it.


## **Introduction**

Most messaging apps today depend on centralized servers. Every time you send a message, it’s stored (even temporarily) on servers you don’t control. Even if they promise encryption, the reality is:
**Your metadata, your IP address, your behavior – all pass through their hands.**

But what if you didn’t need to trust anyone in between?

That’s exactly what Privora is built for.



## **How Privora Works Differently**

At Privora, we believe privacy begins by removing unnecessary middlemen.
**We don’t rely on central servers. Ever.**

Instead, Privora uses:

*   Peer-to-Peer Connections

*   Tor Hidden Services

*   End-to-End Encryption

When you send a message, it’s routed **directly** to the recipient through the Tor network.

No third-party servers. No data collection. No single point of failure.



## **What Happens When You Send a Message?**

Here’s what’s different:

1.  **Privora checks if the recipient is online.**

    If they are, the message goes **directly** over a secure Tor connection, peer-to-peer.

2.  **No servers store your message.**

    Not even temporarily. It’s only stored on your device and the recipient’s – nowhere else.

3.  **If the recipient is offline?**

    You get notified and can choose:
    *Wait until they're online again, or temporarily use an encrypted fallback method (with your permission).*
    **You stay in control.**

****

## **Why Does This Matter to You?**

*   **No Data Mining:**

    We don’t see, store, or sell your data.

    (Because we physically can't. There’s nothing to collect.)

*   **Zero Metadata Leakage:**

    No IP addresses, no contacts, no server logs.

    Your conversations stay yours.

*   **No Censorship, No Shutdowns:**

    Centralized apps can be blocked or surveilled.

    Privora is resistant by design.

*   **You Stay in Control:**

    Decide how your messages are sent – no background tracking.



## **Why Big Apps Won’t Do This**

Let’s be real:

Apps like WhatsApp, Telegram, and others depend on centralized servers for one reason:
**Control.**

It’s easier for them to monetize, collect data, comply with governments, and lock users in.

But at Privora, **you are not the product**.

You’re in charge – no compromises.



## **Conclusion**

It’s time to rethink how messaging works.

If you’re tired of trusting faceless servers with your personal conversations,
**Privora is here to give you back control.**

No middlemen.

No data mining.

Just privacy, as it should be.


Why Privora Doesn’t Rely on Central Servers – And Why That Matters

Updates

Stay up to date with the latest news, development insights, and privacy-first philosophy behind Privora – the decentralized messaging app built for your security and freedom.

Updates

Insights, Updates & Privacy Tips

Why Privora Doesn’t Rely on Central Servers – And Why That Matters

Beyond End-to-End: Cryptography That Defends Against Tomorrow’s Threats

Why Privora Doesn’t Rely on Central Servers – And Why That Matters