Ermis is a cross-platform steganography application for hiding and extracting secret data inside digital media files on Linux.
It supports image and audio carrier files, works with both plain text and arbitrary files, and provides a graphical interface for embedding, extracting, previewing, and managing concealed data. The project also extends beyond media files with text and network steganography capabilities for covert data transfer.
This is free and open source software.
Key Features
- Hides data in PNG, JPG, and BMP images using least significant bit techniques.
- Supports WAV, MP3, FLAC, and OGG audio carriers, with automatic conversion of non-WAV audio using FFmpeg.
- Provides live image previews, side-by-side comparison, and real-time capacity indicators.
- Handles both text messages and file payloads, with filename preservation for embedded files.
- Offers optional AES encryption with passphrase protection.
- Includes a built-in audio player for previewing audio carriers and extracted audio.
- Supports drag-and-drop workflows and clipboard integration.
- Includes text steganography and network steganography modes using ICMP, DNS, UDP, and HTTP/TLS protocols.
Website: github.com/alamahant/Ermis
Support:
Developer: alamahant
License: GNU General Public License v3.0

Ermis is written in C++. Learn C++ with our recommended free books and free tutorials.
Related Software
| Steganography Tools | |
|---|---|
| OpenStego | Java based tool to hide secret data in image files |
| stegify | Tool written in Go for LSB steganography |
| Stegano | Supports hiding data in PNG images via LSB encoding |
| Snow | Whitespace steganography program |
| Stegosuite | Steganography tool which lets hide information in image files |
| jdvrif | Hide files within a JPG cover image |
| Wavsteg | Uses least significant bit steganography to hide a file in .wavs |
| Steghide | Uses an algorithm which is undetectable by color-frequency tests |
| Steganoroute | Send steganographed text messages to mtr with fake hops in the network |
| Stegoshare | Java based steganography tool |
| snowdrop | Text watermarking and watermark recovery |
| OutGuess | Universal steganographic tool |
| Rooks | Adaptive steganography toolkit |
| StegCracker | Steganography brute-force utility to uncover hidden data inside files |
Read our verdict in the software roundup.
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