1 Correction to: Adv. Appl. Clifford Algebras (2019) 29:93 https://doi.org/10.1007/s00006-019-1012-x

Remark 4.1 and Remark 4.5 in Section 4 will be true only if a is a power of two. Hence, the proofs of Theorem 4.2 and Theorem 4.6 hold in the case of a being a power of 2.

More generally, both Theorems 4.2 and 4.6 are true by observing the change of variable \(x \rightarrow y+1\) in the Walsh-Hadamard Transform, as it is a permutation on the finite field, i.e., we get exactly opposite values of the function \(f(x)=\mathrm {Tr}(x)^d\), where d is the Niho exponent. Since the function \(f(x)=\mathrm {Tr}(x)^d\) is near-bent function, the function \(f(x)=\mathrm {Tr}(x+1)^d\) is also a near bent function.