Financial market infrastructures depend critically on communication networks that remain available and secure even during outages and cyber-attacks. SCION is an internet architecture that strengthens resilience by giving users greater control over network paths and allowing traffic to switch rapidly between independently operated providers. The Secure Swiss Finance Network (SSFN), launched by the Swiss National Bank (SNB) and SIX in 2021, shows that this approach works in practice. Financial market infrastructures (FMIs) are the plumbing of the financial system: they allow payments and financial transactions to be settled safely and efficiently. Central banks play several roles in relation to them.
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