AmbiSecure Secure Mail Suite
A white-label platform that wraps S/MIME email signing, email encryption, PDF / PKCS#7 document signing, and document encryption around a hardware-backed credential. The signing key lives in a smart card, PIV applet, or PKCS#11 token — never on a server, never in a key vault that the operator can read.
Signing UX is the easy part. The hard part is the credential.
Hardware-backed signing
Every signing operation calls into a smart card, PIV applet, or PKCS#11 token. The private key never enters the application process — signing is delegated through the standard cryptographic API.
White-label
Branding, domain, trust list, and certificate policy are operator-defined. Resellers and system integrators can deploy the platform under their own identity without rewriting the signing core.
S/MIME end-to-end
Sign and encrypt mail at the client. Mail-server-side encryption (TLS) protects nothing once the message lands; S/MIME protects it through storage.
Document signing
PDF and PKCS#7 detached signatures. Long-Term Validation (LTV) embeds the OCSP response and timestamp so signatures remain verifiable after the certificate expires.
Trust-list management
Operators publish their own trust anchors. Optional bridge to a public trust list (Adobe AATL, EU Trusted List) for cross-domain interoperability.
Audit trail
Every signature event is recorded with a hashed credential fingerprint, timestamp, and policy reference. The audit log is signed by the platform itself.
Where the keys live, where the policy lives, where the integration lands.
Client agent
Desktop application or browser extension that talks to the local credential (smart card via PKCS#11, FIDO authenticator for cert-bound auth).
Policy server
Trust list, certificate policy, audit log, key-history retention. Multi-tenant for white-label operators.
Integration points
SMTP/IMAP for mail; PDF and PKCS#7 for documents; LDAP or SCIM for user-and-cert lookup; SAML / OIDC for operator login.
Where this fits in the bigger picture.
Product: Digital signature token
The hardware credential the suite uses for signing — the token-side primitive.
Product: PKCS Signature Suite
Token + middleware bundle. The Suite consumes it via PKCS#11 for desktop signing flows.
Product: PIV nano-card applet
PIV applet on a nano-card secure element. The signing slot drives the Suite’s document workflow.
Blog: Designing signing platforms
S/MIME ecosystem, PDF/PKCS#7, Long-Term Validation, the trust-list problem.
Solution: Workforce identity
Where mail and document signing fits in a workforce identity deployment.
Reference: X.509 extensions
The certificate fields the suite parses for trust-anchor decisions.
Pilot the Secure Mail Suite.
Tell us your target user count, trust anchors, and credential form factor (smart card, PIV applet, PKCS#11 token). We can stand up a white-labelled pilot in 4–6 weeks.