Discrete Mathematics - Coding Theory
Permutation group algorithms based on partitions, I: Theory and algorithms
Journal of Symbolic Computation - Special issue on computational group theory: part 2
Finite fields
SIAM Journal on Discrete Mathematics
Finding the permutation between equivalent linear codes: the support splitting algorithm
IEEE Transactions on Information Theory
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We study Eq(n), the average dimension of the hull of error-correcting block cyclic codes of a given length n over a given finite field Fq, where the hull of a code is its intersection with its dual code. We derive an expression of Eq(n) which handles well. Using this expression, we prove that either Eq(n) is zero (if, and only if, n ∈ Nq), or it grows at the same rate as n, when n ∉ Nq, where Nq is the set of positive divisors of the integers of the form qi + 1, i 0. This permits us to show that, for almost all n, the hull of most cyclic codes of length n is "large". Moreover, we study the asymptotic behaviour of Eq(n)/n as n tends to infinity.