Blog
Notes on encryption, privacy engineering, and what's shipping in SimXmil — written by the people building it.
Why Every Chat App Needs What Guhya's SimXmil Brings to the Table
e EXIF stripping pipeline — every image sent in a Guhya chat gets stripped of GPS, device, and timestamp metadata automatically, no opt-in needed
Beyond the Padlock Icon: How Diffie-Hellman, the Double Ratchet, and Post-Quantum Cryptography Protect a Chat where SimXmil fits in
SimXmil — the end-to-end encrypted messaging platform previously built by Guhya Technologies — follows broad protocol family for its core chat security: an ECDH-based key and log no metadata
The Backup Blind Spot: Why "End-to-End Encrypted" Chat Apps Still Leak Your Messages Through Cloud Backups
Most 'end-to-end encrypted' chat apps still expose your messages through unencrypted cloud backups. Here's the blind spot — and how SimXmil avoids it.
Can AI Assistants Read Your Encrypted Chats? On-Device Encryption in the AI Era
With AI features built into more messaging apps in 2026, a fair question is whether an AI model ever sees your plaintext. Here's where on-device encryption draws the line.
SimXmil vs Signal vs WhatsApp vs Telegram: How Their Privacy Models Actually Differ
An honest, feature-by-feature look at how SimXmil compares to Signal, WhatsApp, and Telegram on encryption defaults, phone-number requirements, and built-in privacy tooling.
Beyond Chat: A Field Guide to SimXmil's Offline and Tactical Toolkit
BLE tracker detection, RF and Wi-Fi scanning, an offline gazetteer, and a compass — a walkthrough of the field utilities SimXmil bundles alongside encrypted messaging, and when each one actually helps.
Metadata Privacy: What End-to-End Encryption Doesn't Hide (And What SimXmil Does About It)
Encrypting your messages protects the content — not who you talked to, when, or how often. A practical look at metadata privacy and how SimXmil narrows that gap.
Perfect Forward Secrecy Explained: Why a Stolen Key Still Can't Unlock Yesterday's Messages
Forward secrecy is the reason a single compromised key doesn't hand over your whole message history. Here's how it actually works and why SimXmil rotates keys per message.
Safety Numbers Explained: How to Actually Verify Who You're Talking To
Encryption is only as trustworthy as the keys behind it. Here's what safety numbers and key verification actually check, why it matters, and how to do it in SimXmil.
SimXmil vs SimpleX Chat: Are They the Same App? (No — Here's the Difference)
SimXmil and SimpleX Chat sound alike but are unrelated products from different teams. Here's a clear, factual breakdown of how they differ so you don't confuse the two.
Why an Encrypted Messenger Without a Phone Number Matters
How chat apps that require a phone number create privacy risks — and why SimXmil offers free encrypted voice calls and chats without SIM linking.
End-to-End Encryption Explained Simply
A clear, non-hype guide to end-to-end encryption: what it protects, what it does not, and how SimXmil applies on-device encryption to chat and calls.
How to Choose a Private Messenger: A Practical Checklist
A practical checklist for choosing a private messenger: encryption defaults, identifiers, verification, offline tools, and what SimXmil optimizes for.
Double Ratchet, Explained: How SimXmil Gives Every Message Its Own Key
A plain-language (and slightly mathematical) walkthrough of the Double Ratchet algorithm SimXmil uses so that no single leaked key exposes more than one message.
Guhya Is Now SimXmil: Same Encryption, New Name
Guhya Technologies has renamed its encrypted messenger from Guhya to SimXmil. Here is exactly what changed — and what did not.