Improved integral cryptanalysis of SPNbox in digital rights management systems by Jun Liu, Dachao Wang, Yupu Hu, Jie Chen, Baocang Wang

“…SPNbox, proposed at Asiacrypt’16 is such a white‐box cipher that fulfils comprehensive resistance against key exposure for digital rights management systems, including black‐box security on the server‐side and white‐box security on the client‐side. …”
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