TY JOUR TI Modification of the post-quantum key encapsulation mechanism “Zemlyanika” KW KEM Zemlyanika KW post-quantum cryptography KW Module-LWE KW NTT KW quasi-power-of-two modulus KW polynomial multiplication KW cryptographic security KW scheme correctness JO Vestnik of Astrakhan State Technical University. Series: Management, computer science and informatics AU Daviduk, N.. AU Efendiev, F.. AU Popov, G.. PY 2026 IS 2026 PB Astrakhan State Technical University