Picohsm, a $5 open-source hsm
An open source Hardware Secure Module in your hands. Keep your private and secret keys safe with Pico HSM.
Picohsm, a $5 open-source hsm launched on March 31, 2024 with 50 votes, #1,017 of 4,270 launches that month and more than 90% of that year's launches. The site was still online in September 2026, 2 years on.
In plain words
Picohsm is an open-source hardware security module priced at $5. Designed for developers, it provides cryptographic key storage and management capabilities in an affordable, compact form. The tool is suitable for anyone needing basic HSM functionality without enterprise-level costs, making it accessible for small projects, testing, and educational purposes where hardware-backed security is required.
written from the facts on this page · September 2026
From the sources
Hierarchical Deterministic (HD) key derivation (BIP32 and SLIP10). Pico Keys is a set of firmwares ready to run on any Raspberry Pico or ESP32-S3 microcontroller.. Each firmware ( Pico HSM , Pico Fido and Pico OpenPGP ) follows separate standardized specifications with different purposes but with a single common premise: having a personal key device. Just download the firmware for your board and load it. It will convert your Pico device into a personal key. Just plug it in your USB and it will be identified by your OS automatically. If you need to generate and store dozens of keys, then go for Pico HSM . If you are looking for a personal Passkey (Fido2) for secure logging, then go for Pico…from picokeys.com
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