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Initial release. • Offline AES-256-GCM encrypted NFC messaging — no account or network needed • Read, write, and clear encrypted messages on NDEF and MIFARE Classic tags • Password never stored; decrypted content auto-clears from clipboard after 60 seconds • Real-time size estimate so you know your message fits before you write • Clear diagnostics for wrong passwords, unrecognized tag formats, and tag-loss events
Offline NFC messenger — encrypt, write, and read secret messages on NFC tags
Source available on GitHub: https://github.com/AlsatianConsulting/NFCommunicator NFCommunicator lets you store one encrypted plain-text message on an NFC tag and read it back using a shared password — entirely offline, with no account or cloud service required. WHAT IT DOES • Writes an AES-256-GCM encrypted message to any writable NFC tag • Reads and decrypts the message when the correct password is supplied • Clears app-owned message data from a tag when you no longer need it • Supports NDEF tags and raw MIFARE Classic tags on compatible devices HOW IT WORKS Write mode: enter a password, confirm it, type your plain-text message, then hold a tag to the phone. The message is encrypted with a fresh random salt and nonce and written to the tag. Read mode: hold a tag to the phone. If it contains this app's encrypted data, you will be prompted for the password. Enter it and tap Try Password to decrypt. Clear mode: hold a tag to clear this app's message payload from it without affecting other tag data. SECURITY AND PRIVACY • AES-256-GCM encryption with PBKDF2-HMAC-SHA256 key derivation • Random salt and nonce generated per message — no two ciphertexts are alike • Password is never stored anywhere on the device • Decrypted text exists only in memory while it is on screen • No network permissions — the app makes zero network connections • No analytics, no ads, no accounts • FLAG_SECURE prevents decrypted content from appearing in screenshots or the recent-apps thumbnail TAG COMPATIBILITY • Standard NDEF read, write, and clear on all compatible tags • Raw MIFARE Classic 1K/4K read, write, and clear on handsets that expose the low-level interface • Automatic backend selection — prefers raw MIFARE Classic when available • Real-time encrypted size estimate before you write, so you know the message fits USER EXPERIENCE • Passive NFC detection — just hold a tag to the screen, no button press required • Character count and per-backend size estimates shown while you type • Copy-to-clipboard with a 60-second auto-clear to protect decrypted content • Haptic feedback on card detect, write success, and error • Clear diagnostic messages for wrong passwords, unrecognized tag formats, tag loss, and unsupported hardware • Dark orange theme optimized for readability in field conditions WHO IT IS FOR • Teams sharing offline credentials, access codes, or instructions on physical NFC tags • Field workflows where network connectivity is unavailable or untrusted • Anyone who needs a simple, auditable way to put an encrypted secret on a physical object REQUIREMENTS • Android 8.0 (API 26) or later • Device with NFC support • Writable NFC tag with sufficient capacity for your message • A shared password known to both the writer and the reader