Phasm: Steganography
by Christoph Gaffga
· Utilities
· Free
On the App Store since March 2026
· Data updated
Phasm: Steganography is made and published by Christoph Gaffga. AppBrain is an independent app data site and isn't affiliated with Christoph Gaffga. The app name, icon, screenshots and description belong to Christoph Gaffga and are shown as published on the App Store.
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- Last updated
- October 21, 2026
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Releases
Updates seen on the App Store- Version
- 1.8.0
- Launched
- March 2026
No changelog data
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Technology
Found in the app by AppBrain- Price
- Free
- App size
- 24.1 MB
- Content rating
- Everyone
Technologies used by Phasm: Steganography
About the app and developer
About Phasm: Steganography
Phasm: Steganography is an utilities app developed by Christoph Gaffga.
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The app has no ratings yet.
App Information
Phasm: Steganography is freely available from the App Store. The app size is 24.14 MB. The latest version available is 1.8.0. The last update was on October 21, 2026.
Technical Requirements
The app has a content rating of Everyone. The app has been available on the App Store since March 2026.
Developer information for Christoph Gaffga
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Store listing
By Christoph Gaffga, from the App Store
Screenshots by Christoph Gaffga, from the the App Store listing
Description by Christoph Gaffga Written by the developer, not by AppBrain. Click to read.
Hidden in plain sight.
Phasm turns ordinary photos into secret messengers. Your photo looks exactly the same — but it carries encrypted messages and files that only someone with the right passphrase can reveal.
TWO MODES FOR TWO NEEDS
• Ghost Mode — Maximum stealth. Advanced adaptive algorithms make hidden data virtually undetectable, even by statistical analysis tools. Deep Cover auto-activates for non-JPEG photos with ~43% more capacity. Supports file attachments alongside your message.
• Armor Mode — Maximum durability. Your hidden message survives recompression, re-encoding, and mild cropping. Fortress sub-mode auto-activates for short messages and handles aggressive compression from popular messaging apps.
SERIOUS ENCRYPTION
• AES-256-GCM-SIV authenticated encryption — always on, not optional.
• Argon2id key derivation — resistant to brute-force and GPU attacks.
• Post-quantum safe — 256-bit symmetric keys remain secure against quantum computers.
• No backdoors. No key escrow. You hold the only key.
PRIVACY BY DESIGN
• All processing happens on your device. Nothing is uploaded.
• No account. No sign-up. No tracking. No ads.
• Open-source Rust cryptographic engine — auditable by anyone.
• Built for journalists, researchers, activists, curious tinkerers — or just for fun.
ONE PHOTO. MULTIPLE SECRETS.
Shadow Messages let you hide several independent messages in a single photo — each locked with its own passphrase. Send the same picture to five friends; each one discovers a different message using their name as the key. Nobody knows the others exist. Under pressure to reveal your passphrase? Hand over the primary one. Your shadow messages stay invisible — no header, no marker, no proof they were ever there.
MAGIC WAND — ONE TAP TO OPTIMIZE
Tap the wand and your photo is silently tuned for better steganographic embedding. Imperceptible texture is added to smooth regions like skies, bokeh, and flat backgrounds — boosting capacity by 10–35% with no visible change. The photo looks identical. The math works better.
SHARE YOUR WAY
• Share via AirDrop, Messages, email, or any app that handles images.
• phasm.link — generate a short link so recipients can decode instantly in the browser or via App Clip. No install needed.
• For guaranteed delivery through messaging apps, use "send as file."
BUILT FOR iPHONE AND iPAD
• Native app optimized for iPhone and iPad.
• Supports JPEG, PNG, GIF, WebP, and HEIC — auto-converted for embedding.
• Real-time decode progress with integrity scoring.
• 38 languages supported.
HONEST ABOUT LIMITATIONS
• Platforms that resize or re-encode photos may destroy hidden data. Use direct sharing or "send as file."
• Capacity depends on image resolution — larger photos carry more data.
• Steganography hides the existence of a message. Encryption protects its content. Phasm gives you both.
Phasm turns ordinary photos into secret messengers. Your photo looks exactly the same — but it carries encrypted messages and files that only someone with the right passphrase can reveal.
TWO MODES FOR TWO NEEDS
• Ghost Mode — Maximum stealth. Advanced adaptive algorithms make hidden data virtually undetectable, even by statistical analysis tools. Deep Cover auto-activates for non-JPEG photos with ~43% more capacity. Supports file attachments alongside your message.
• Armor Mode — Maximum durability. Your hidden message survives recompression, re-encoding, and mild cropping. Fortress sub-mode auto-activates for short messages and handles aggressive compression from popular messaging apps.
SERIOUS ENCRYPTION
• AES-256-GCM-SIV authenticated encryption — always on, not optional.
• Argon2id key derivation — resistant to brute-force and GPU attacks.
• Post-quantum safe — 256-bit symmetric keys remain secure against quantum computers.
• No backdoors. No key escrow. You hold the only key.
PRIVACY BY DESIGN
• All processing happens on your device. Nothing is uploaded.
• No account. No sign-up. No tracking. No ads.
• Open-source Rust cryptographic engine — auditable by anyone.
• Built for journalists, researchers, activists, curious tinkerers — or just for fun.
ONE PHOTO. MULTIPLE SECRETS.
Shadow Messages let you hide several independent messages in a single photo — each locked with its own passphrase. Send the same picture to five friends; each one discovers a different message using their name as the key. Nobody knows the others exist. Under pressure to reveal your passphrase? Hand over the primary one. Your shadow messages stay invisible — no header, no marker, no proof they were ever there.
MAGIC WAND — ONE TAP TO OPTIMIZE
Tap the wand and your photo is silently tuned for better steganographic embedding. Imperceptible texture is added to smooth regions like skies, bokeh, and flat backgrounds — boosting capacity by 10–35% with no visible change. The photo looks identical. The math works better.
SHARE YOUR WAY
• Share via AirDrop, Messages, email, or any app that handles images.
• phasm.link — generate a short link so recipients can decode instantly in the browser or via App Clip. No install needed.
• For guaranteed delivery through messaging apps, use "send as file."
BUILT FOR iPHONE AND iPAD
• Native app optimized for iPhone and iPad.
• Supports JPEG, PNG, GIF, WebP, and HEIC — auto-converted for embedding.
• Real-time decode progress with integrity scoring.
• 38 languages supported.
HONEST ABOUT LIMITATIONS
• Platforms that resize or re-encode photos may destroy hidden data. Use direct sharing or "send as file."
• Capacity depends on image resolution — larger photos carry more data.
• Steganography hides the existence of a message. Encryption protects its content. Phasm gives you both.