When a company starts working with clients that demand security guarantees, or with public administration, the question of which certification to pursue comes up: ISO 27001, Spain's National Security Framework (ENS), or both?
ISO 27001 is an international information security management standard, valid for any sector or country, and the usual reference if you work with private or international clients. ENS is mandatory for Spanish public administrations and for companies providing them services that involve handling public information or systems — it is not optional in that case, it is a legal requirement.
If you work or want to work with Spanish public administration, ENS is not a choice, it is a requirement. If your market is private and you want to signal trust to clients in any country, ISO 27001 is the more widely recognized route. Many companies end up obtaining both, since they share a large part of the required controls.
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