Attack with known image to a symmetric image encryption scheme
Chenhui Jin · Systems engineering and electronics · 2007
To study the security of a symmetric image encryption scheme with known image,an attack algorithm of equivalent key is given.The attack algorithm is based on the affinity of 3D chaotic cat map used by the symmetric image encryption scheme.With the known image,the equivalent key of 3D chaotic cat map can be found by three linearly independent plain-cipher text image grey values.The other equivalent keys can be found by the brute attack algorithm.The concrete step and complexity of the attack algorithm is given.It is proved that the encryption algorithm proposed in 《A symmetric image encryption scheme based on 3D chaotic cat maps》 is insecure in the known image attack.