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T-function
In cryptography, a T-function is a bijective mapping that updates every bit of the state in a way that can be described as x_i' = x_i + f(x_0, cdots, x_{i-1}), or in simple words an update function in which each bit of the state is updated by a linear combination of the same bit and a function of a subset of its less significant bits. If every single less significant bit is included in the update of every bit in the state, such a T-function is called triangular.
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