Efficient computation of polynomial multiplication for characteristic three fields, F3n for n ≥ 1, is an important attribute for many cryptographic protocols. In this paper, we propose three new polynomial multiplication algorithms over F3[x] and show that they are more efficient than the current state-of-the-art algorithms. We first examine through the well-known multiplication algorithms in F3[x] including Karatsuba-2-way and 3-way split formulas along with the recent enhancements. Then, we

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... opose a new 4-way split polynomial multiplication algorithm and an improved version of it which are both derived by using interpolation in F9. Moreover, we propose a 5-way split multiplication algorithm, and then compare the efficiencies of these algorithms altogether. We apply the proposed algorithms to the NTRU Prime protocol, a post-quantum key encapsulation mechanism (KEM), submitted to the NIST PQC Competition by Bernstein et al., performing polynomial multiplication in characteristic three fields in its decapsulation phase. We observe that the new hybrid algorithms provide a 12.9% reduction in the arithmetic complexity. Furthermore, we implement these new hybrid methods on Intel (R) Core (TM) i7-9750H architecture using C and obtain a 37.3% reduction in the implementation cycle count.