SCION is a new internet routing architecture developed at ETH Zürich that replaces BGP with a secure, multi-path system designed to prevent hijacking and outages. Unlike BGP's decades-old, unauthenticated framework, SCION uses cryptographic path validation and isolation domains to ensure packets follow pre-approved routes. This prevents nation-state attacks and cascading failures like the 2015 ATM outage across Europe. The Swiss financial sector, handling 220 billion francs daily, adopted SCION for its interbank network after finding no viable alternatives, marking a significant real-world test of the academic project.

Adrian Perrig, SCION's creator, argues BGP's fundamental design flaws require architectural overhaul rather than incremental fixes. His system establishes multiple parallel paths between nodes, enabling millisecond failover during outages – faster than human reaction time. Cryptographic signatures on every router ensure packets cannot be rerouted through unauthorized networks. This isolation prevents compromises in one domain (like Australia's 2015 ATM failure) from affecting others, a critical feature for global finance.

While BGP remains entrenched in global infrastructure, SCION's adoption by SIX Group, operator of Switzerland's interbank payment system, demonstrates its practical viability. Perrig's decade-long academic pursuit faced skepticism but gained traction after proving its real-world application in Switzerland's high-stakes financial network, where failure is not an option.