Screenshots & videos
About
Ermis is a cross-platform steganography application that allows you to hide and extract secret data within digital media files. Named after the Greek god of messages and communication, Ermis enables covert communication through innocent-looking image and audio files. Image Steganography: Audio Steganography: Data Handling: Security Features: User Interface: - Hide data in PNG, JPG, and BMP images using LSB (Least Significant Bit) techniques - Live preview of original and modified images with side-by-side comparison - PRT Artistic Mode: Specialized visual steganography for camera-scannable codes - Real-time capacity indicator showing available hiding space - Support for WAV, MP3, FLAC, and OGG audio files - Automatic conversion of non-WAV files using FFmpeg - Built-in audio player with play/pause/stop and volume controls - Metadata extraction for accurate capacity calculation - Text input for hiding plain messages with UTF-8 encoding - File input for hiding any file type with filename preservation - Smart marker system (0x00 for text, length byte for files) - Automatic detection of data type during extraction - Optional AES encryption with passphrase protection - ENCR marker for automatic encrypted data detection - Passphrase memory during current session - Secure extraction with decryption prompts - Dual-tab interface for hiding and extracting data - Drag and drop support for both images and audio files - Clipboard integration for one-click text copying - Image preview highlighting with file path display - Camera integration for scanning PRT artistic codes
Changelog
UPnP port management and NAT traversal: - UPnP Port Manager for automatic router configuration - Open and close TCP/UDP ports without manual forwarding - List active UPnP mappings (supports most routers) - Test router connectivity to verify UPnP availability - Local port tracking for routers without listing support - Auto-close all open ports on application exit - Bundled miniupnpc library for Flatpak builds - Flatpak sandbox compatibility with proper rpath config
Additional information
- Developer
- Alamahant
- License
- GPL-3.0-or-later
- Category
- Security
- Size
- 18.3 MB
- Homepage
- https://github.com/alamahant/Ermis
- Available via
- Flathub (Flatpak), AUR
- Catalog data as of
- 9/3/2026 (dataset snapshot date — per-app update dates aren't tracked yet)