SIGrypt is an end-to-end encrypted and LoRa-based communication software. Operates on quantum resistant cryptography such as AES-256-CTR, SHA-384, and HMAC-SHA384. Designed to be a PSK model and P2P.
- x86-64 Linux System
- CPU with AES-NI
- Reyax RYLR998 LoRa Module
- USB to TTL Serial Converter
🔌 For help with wiring from TTL to USB check images/connections.webp
This repository uses zero libraries for portability, transparency, and attack surface reduction.
- Native AES-256-CTR : Passed official NIST SP 800-38A CTR and IETF RFC3686 CTR official test vectors
- Native SHA-384 : Passed official NIST test vectors (SHA384ShortMsg.rsp, SHA384LongMsg.rsp, SHA384Monte.rsp)
- Native HMAC-SHA384 : Passed official NIST test vectors (HMAC.rsp)
Anti-replay techniques are employed such as:
- Duplicate ID Caching: Caches the 2 most recent message IDs (Rejects payload if its ID is already cached)
- Time-sensitive Validation: Rejects old payloads (Payload Age > 30 seconds)
- Cryptographically Binded: Binds timestamp of payload using native HMAC-SHA384
| Settings | Location |
|---|---|
| Spreading Factor: AT+PARAMETER=8,7,1,8 | include/behaviour_config.inc |
| Network ID: AT+NETWORKID=18 | include/behaviour_config.inc |
| Mode: AT+MODE=0 | include/behaviour_config.inc |
| Output Power: AT+CRFOP=20 | include/behaviour_config.inc |
| Receiver Address: AT+ADDRESS=7775 | include/behaviour_config.inc |
| Sender Address: AT+ADDRESS=7776 | include/behaviour_config.inc |
| Frequencies: Frequency hopping with 1 of the 20 tables containing 50 shuffled frequencies (908 MHz to 920.25 MHz). When sorted, distance between adjacent frequencies is 250 kHz | include/frequency_variations.inc |
FCC Part 15 Note: Plaintext input is capped at 1024 bytes to help limit on-air time (dwell/occupancy) when frequency hopping, in an effort to stay within FCC Part 15 expectations.
SIGrypt is designed to not transmit if input is > 1024 bytes.
- 24 word key
- Frequency table number
For tips on storing keys and options, see /keymgmt
- This project is configured for the US 902–928 MHz ISM band.
- It is not intended for use in other countries/regions.
- You are responsible for legal operation and compliance with FCC rules (frequency use, transmit power, antenna, hopping/dwell time, duty cycle, and any required labeling/testing for your finished device).
- FCC-certified modules do not automatically make your full build/product compliant.
- This software is provided as-is with no warranty of regulatory compliance.
- Increase compatibility to the HackRF One board
- Maintain the repository and update regularly