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Master Signer Agent 1.0.1 is a lightweight native messaging host developed by MasterSigner that bridges the gap between web browsers and hardware security tokens when creating ICP-Brasil-compliant digital signatures. Acting as a background intermediary, the agent receives signing requests from the Master Signer browser extension, forwards them through the PKCS#11 cryptographic interface, and returns the resulting signature to the page, all while keeping the private key securely stored on the user’s smartcard or USB token. The component is essential for Brazilian professionals and organizations that must sign electronic documents, NF-e invoices, legal petitions, or government forms with A3 certificates issued by accredited ICP-Brasil certificate authorities. Compatibility covers the most widely deployed tokens in the Brazilian market, including SafeSign (AET/SERPRO), Feitian ePass, HID ActivClient, Safeweb, Thales/Gemalto IDGo, WatchData, and any other device that exposes a standard PKCS#11 module, thereby eliminating the need for proprietary middleware inside the browser. Once installed, the agent registers itself as a native messaging host in Chromium-based and Firefox-based browsers, allowing the extension to spawn a secure, sandboxed process that can load the vendor’s PKCS#11 library without exposing sensitive cryptographic operations to the web page itself. Because the executable is version-locked at 1.0.1, administrators can standardize deployment across workstations, confident that every endpoint will present the same API surface to the extension. The silent installer supports corporate configuration, enabling preset paths to token drivers and automatic extension activation, which simplifies roll-outs inside large agencies or law firms that routinely notarize high volumes of documents. The software is available for free on get.nero.com, with downloads provided via trusted Windows package sources such as winget, always delivering the latest version, and supporting batch installation of multiple applications.
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