Image Encryption Scheme Using Combined Key Sequence of Logistic and Tent Map for Medical Applications

Securing the clinical records of the patient is very much important. Conventional encryption methods might not be robust for the applications of medical images due to their statistical properties. In this paper, the Combination of Logistic and Tent map based on image encryption method for medical image application is proposed. Initially, the Logistic and Tent map key sequence is combined by employing an XOR operation. The resulting sequence is XORed with medical image pixels. Hence the encrypted image is obtained. To evaluate the performance, ten different test images are chosen. The parameters like Entropy, Correlation and Mean Square Error (MSE) are used to analyse the security of the proposed scheme. Further, the proposed scheme is compared with schemes using Tent map and Logistic map alone. The results obtained demonstrate that the proposed encryption scheme provides better performance compared with a scheme using the sequence of Logistic map or Tent map alone.