Phasm: Steganography

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.