ChecklistRansomware attack: what to do in the first 72 hours
Ransomware has hit your business? The right moves hour by hour, from H+0 to H+72: isolate, report, call your insurer and the regulator, then recover safely.
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Complete articles to take action, a new one every week: NIS2 obligations, email, accounts, backups, website security settings and real measurements of public websites.
Scheduled articles
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Checklist
Barometer · October 20262026 barometer: website security of the CAC 40
Passive measurement of the CAC 40 corporate websites: 93% graded A or A+, 85% of domains enforce DMARC, against 34% for large French cities.
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GuideDMARC, SPF and DKIM setup: how to stop criminals spoofing your email domain
SPF, DKIM and DMARC explained simply: sample DNS records, a staged path to p=reject, common pitfalls, and what Gmail, Yahoo and Outlook.com now require.
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Barometer · October 20262026 barometer: website security of large French cities
Passive measurement of the websites of France’s 100 largest cities: 66% enforce no DMARC, 40% lack HSTS, 31% have a CSP.
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Guide · NIS2NIS2 checklist for SMEs: requirements and deadlines
NIS2 for small businesses: who is in scope, the 10 required measures, 24h and 72h incident reporting, fines, management liability and a 15-point checklist.
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Guide · websiteWebsite security check: SSL test, HTTPS and headers
Website security check: SSL certificate test, A+ to F grade, HTTPS, HSTS, security headers, DMARC and cookies. A PDF report in minutes.
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From theory to practice
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