What accounting firms go through
Designed for your profession
What we actually see when we open an accounting firm's IT system
An accounting firm keeps its clients' tax records for 10 years, exchanges continuously with the French tax authorities and social security, transmits accounting files, tax returns, payslips. All of this goes through email, ageing platforms, sometimes still via USB stick. The attack peak is concentrated in January-March, in the middle of tax season, when the team is under pressure and opening a suspicious attachment costs the firm far more than the attacker.
Add to this the rising contractual demands from mid-cap clients (ISO 27001 required for vendor approval, supplier security audits, reinforced confidentiality clauses) and the regulatory obligations specific to the sector (anti-money laundering law, professional secrecy, evidentiary archiving). A firm without a serious cyber plan in 2026 takes a risk that far exceeds the cost of a remediation engagement.
"The DYB team picked up a project three providers had abandoned. In 6 weeks, it was in production."
Sophie Martinel, partner at Martinel Firm, had been looking for two years for an IT partner capable of understanding both the constraints of the accounting profession (GDPR, professional secrecy, long-term archiving) and those of a growing firm (onboarding new files, adjusting tools, continuous training). Three successive providers had failed. DYB delivered the secure client portal in six weeks, took over IT estate management, and now supports the firm on staff awareness.
Audit your firm's cybersecurity
30-min discussion with no commitment, focused on the challenges of an accounting firm. We won't talk to you about generic ransomware or a large-group CISO roadmap.
Book a cyber-accounting audit
