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Which blocks of two letters [x, y] will remain unchanged by the block cipher below? [Hint: Use matrices, and then write out and solve the

Which blocks of two letters [x, y] will remain unchanged by the block cipher below? [Hint: Use matrices, and then write out and solve the resulting linear congruences modulo 26.]

C₁ cong 6P₁ + 7P₂ (mod 26)

C₂ cong 4P₁ + 3P₂ (mod 26)

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