DKIM Signing Key Compromise Response

A forty-hour Pro-level email-authentication crisis simulation run on a live DKIM crisis command board, where you are Head of Messaging Security at a UK bank with 6.8 million customers; a former marketing vendor's breach exposes a seven-year-old, 1024-bit signing key shared by three streams, and forged mail passes DKIM and DMARC as the bank — and you revoke without breaking passcodes, find every key and every sender, enforce DMARC to reject, make customers whole, meet the mailbox providers' rules, build detection and custody, price the programme at the margin and defend it to the Board.

What you'll learn

• Lead a signing-key compromise: establish what signatures still prove, set a revocation clock that re-keys critical streams first, and hold the cut-over when surprises arrive.
• Build and govern the signing estate — inventory, key segregation and custody, length and rotation standards, delegated signing and third-party senders — so no key is shared, moved or unowned.
• Enforce DMARC to reject through gated steps, protect and inform customers, meet mailbox-provider requirements by placement, and detect the next compromise from the organisation's own reports.
• Price the programme at the margin, answer insurers and auditors precisely, set appetite and accept residuals explicitly, and win a resolution the Board can be held to.

Sign in to enrol — you can pay by bKash or Nagad, or apply a promo code.