OEMCrypto on +5 Security Researchhttps://overkazaf.github.io/blogs/tags/oemcrypto/Recent content in OEMCrypto on +5 Security ResearchHugozh-cnMon, 24 Aug 2026 17:18:00 +0800有了 PSSH 还是拿不到 Key，从 L3 到 L1 有多远https://overkazaf.github.io/blogs/posts/widevine-pssh-license-l1-deep-dive/Sat, 22 Aug 2026 14:00:00 +0800https://overkazaf.github.io/blogs/posts/widevine-pssh-license-l1-deep-dive/从 Widevine SystemID、PSSH protobuf 与 CENC box 结构开始，沿 Chrome/Android 通信架构、License Proxy、设备 Provisioning、MediaDrm、OEMCrypto、L1/L2/L3 和安全输出还原完整信任链。