Victoria Mellor

Key Recovery from Embedded Symmetric-Cipher Key Schedules via Sequential Peeling on Lagrangian Submanifolds

: We show that a symmetric-cipher key schedule embedded onto a Lagrangian submanifold leaks its key in closed form. In the Lagrangian Balanced Encryption (LBE) construction, each schedule byte sets the kick strength of one iterate of the Chirikov standard map, and the difficulty of identifying a Lagrangian from limited...