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SwiftRNG LE (Lite Edition) is a general purpose USB device that generates true (hardware) random numbers at a rate of 29 Mbits per second. It can be used in conjunction with SwiftRNG Pro, SwiftRNG Z and SwiftRNG.

Are you a student or educator? Learn about our education discount. “Add to Cart” button not working? Visit our shop directly here. SwiftRNG LE is also available on Tindie.

Devices will be shipped in 1–2 business days. For bulk orders of 10 or more devices, please contact us. Please note that for orders outside of the United States, the buyer is responsible for costs such as duties, taxes, and customs clearance when the shipment is picked up in the destination country.

How it works

SwiftRNG LE utilizes random noise generated from two independent and reliable sources based on the electrical noise produced by an avalanche breakdown effect in zener diodes. The electrical noise generated by each random source is independently amplified, filtered and converted into digital values. The random bytes generated by both noise sources are then combined into the resulting random byte stream. To further reduce the bias, the resulting bytes are hashed as part of a post processing step that produces the final true random bytes. The random bytes are transmitted to the host computer via USB in 16,000 byte packets.

Quality checking

SwiftRNG LE implements an embedded health check test (HCT) that continuously monitors the quality of the random noise sources immediately after the electrical noise is digitized and before any further processing. The HCT logic appends a health check status byte to each transmitted data packet so that the host computer is continuously notified about the health of the generator.

‘Repetition Count Test’ and ‘Adaptive Proportion Test’ tests are continuously performed through provided SwiftRNG Software API on the host computer to ensure the quality of the final random bytes retrieved through the USB interface.

SwiftRNG LE contains patented technology.

Tech specs

More tech specs Data sheet

Current device version V1.5
True random byte download speed 29 Mbps using USB highspeed compatible interface
Power consumption Draws no more than 140 mA in active mode and 70mA when inactive
Weight 21 grams (0.74 oz)
Data connectivity and control interface USB 2 high-speed interface with EMI filtering (also compatible with full-speed interface)
Random noise source Two independent circuits based on avalanche breakdown effect in reversed-biased Zener diodes
Device security Secure booting from an encrypted firmware image, device access and debugging disabled
Post processing algorithms available SHA-256, SHA-512, Marsaglia’s XorShift64
Embedded health check test (HCT) Continuous health diagnostics of all random noise sources
Implemented statistical tests Continuous ‘Repetition Count’ and ‘Adaptive Proportion’ statistical tests through provided SwiftRNG Software API
Power supply USB bus powered
RoHS compliance All parts and materials are lead-free and RoHS compliant
Country of origin U.S.

Use cases

SwiftRNG LE is a versatile device that can be used for a wide range of purposes:

  • Generation of encryption and secure session keys
  • Feeding the /dev/random entropy pool
  • Research (statistical sampling)
  • Computer simulations
  • Gaming servers

Statistical tests

SwiftRNG LE device passes the following statistical test suites for measuring the quality of a random number generator: Diehard, Dieharder, NIST, Rngtest, Ent, EA IID.

You can download sample test reports using links below:

System requirements

  • Linux (x86, x64)
  • or FreeBSD 12/13
  • or macOS (Intel and M1 chips)
  • or Windows 10/11 (64 bit), Windows Server 2016/2019 (64 bit)
  • USB 2.0 or 3.0 high-speed host/hub

Virtual machine compatibility

SwiftRNG LE V1.3+ device has been tested with the following VM software:

  • VMware ESXi 6.7.0
  • VMware Workstation 15 Player
  • Oracle VirtualBox 6.1
  • Parallels Desktop for Mac (Intel & ARM)

Warranty and return policy

TectroLabs offers a 1-year limited warranty on SwiftRNG LE. We will repair or replace (at our sole discretion) any device that fails due to defect in materials or manufacturing. SwiftRNG LE device may be returned within 30 days of purchase for a full refund minus credit card processing charge (buyer will pay for return shipping).