Abstract
Galois Field GF(2^n) is valuable to encryption and has been used in some famous encryption algorithms, such as BCH and AES. In practical application, image encryptions are used widely to protect information in transmission. This paper will propose two image encryption techniques based on two novel mappings over GF(2^n): One involves a transformation consisting of a linear transformation and a Frobenius automorphism, which shuffles pixels’ positions, that is, a permutation, giving a good diffusion effect, and another one alters pixels’ values and gives dramatic confusion effect. Key Words: Galois field; Frobenius automorphism; Linear transformation; Confusion; Diffusion
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