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1.

College student hacks Taiwan high-speed rail line with software defined radios, stopping four trains — 19 years without crypto key rotation ends in predictable result as hacker sails through 7 layers of protection (tomshardware.com)

2026-05-07 | by Bruno Ferreira | get Software Defined Radio Kit → | tags: taiwan high-speed rail, software defined radio, tetra system

2.

You don't want long-lived keys (news.ycombinator.com)

2026-04-21 | by Security Engineer | get YubiKey Security Key → | tags: cryptographic keys, key rotation, ephemeral keys

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