A Binary Text Image Authentication Algorithm Based on Short Digital Signature

A new binary text image authentication algorithm based on short digital signature is proposed for protecting binary text image completely. The digital signature is used to certificate the uniform blocks and the normalization pretreatment is used to certificate the non-uniform blocks. False alarms can be eliminated by joint certification. The experiments and the analysis show that the content of binary text images can be protected completely by appending very short digital signature to the original image. With fine visual effect, the algorithm has high performance in detecting and locating tampers.