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Layered ROLLO-I: Faster rank-metric code-based KEM using ideal LRPC codes

. For the fast cryptographic operation, we newly propose a key encapsulation mechanism (KEM) called layered ROLLO-I by using block-wise interleaved ideal LRPC (BII-LRPC) codes. By multiplying random polynomials by small-sized ideal LRPC codes, faster operation can be obtained with an additional key size. Finally, some parameters of the proposed algorithm are suggested and compared with that of the existing ROLLO-I scheme.