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approach to improving the security of an LFSR is to pass the entire state of a single LFSR into a non-linear filtering function.

Other designs

280pxInstead of a linear driving device, one may use a nonlinear update function. For example, Klimov and Shamir proposed triangular functions (T-functions) with a single cycle on n-bit words.

Security

For a stream cipher to be secure, its keystream must have a large period,

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