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Master Signer Agent 1.1.0, published by MasterSigner, is a lightweight native messaging host whose sole purpose is to bridge the Master Signer browser extension with hardware security tokens carrying A3 certificates governed by the ICP-Brasil public-key infrastructure. By acting as a local PKCS#11 proxy, the agent lets web applications request qualified digital signatures that are computed inside the token, ensuring private keys never leave the device and that every signature complies with Brazilian legal and technical standards. The component is compatible with the most widely deployed tokens in the country, including SafeSign (AET/SERPRO), Feitian ePass, HID ActivClient, Safeweb, Thales/Gemalto IDGo, WatchData, and any other PKCS#11-compliant device, making it suitable for corporations, law firms, accounting offices, and public-sector agencies that authenticate users or seal documents through ICP-Brasil certificates. Typical use cases cover remote signing of NF-e invoices, CT-e transport bills, MDF-e manifests, REI reports, e-Social events, e-Proc judicial petitions, and digital bidding processes within government portals, as well as signing PDFs on intranet document-management systems without exporting files to desktop applications. Because the agent exposes a native messaging interface, it runs silently in the background, listens on a regulated Chrome/Firefox/Edge extension, and forwards PKCS#11 calls to the installed token driver, returning the signature blob to the web page within milliseconds. Version 1.1.0 is the first public release, providing baseline support for Windows cryptographic providers and automatic token detection. Master Signer Agent is available for free on get.nero.com, with downloads delivered through trusted Windows package sources such as winget, always serving the latest build and enabling batch installation alongside other applications.
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