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Recently, a few chosen-ciphertext secure (CCA2-secure) variants of the McEliece public-key encryption (PKE) scheme in the standard model were introduced. All the proposed schemes are based on encryption repetition paradigm and use general transformation from CPA-secure scheme to a CCA2-secure one. Therefore, the resulting encryption scheme needs separate encryption and has large key size compared to the original scheme, which complex public key size problem in the code-based PKE schemes. Thus,arXiv:1302.0347v4 fatcat:xob7a65jmbauplgws5mzjxaede