An Improvement on Code for Detection of Tampering in Write-Once Optical Disks

Abstract

It is obvious that we can protect the integrity of the data in write-once optical using cryptographic techniques like digital signatures. However, a code for detection of tampering in write-once optical disks without using digital signature, is proposed in [1]. The technique in [1] is to choose a t-error correcting/all unidirectional error detecting (t-EC/AUED) code as a security tail, such that we can check possible tampering. The tail for a sector of data is a function of the weight of the sector. Here, We present a new look-up-table method to construct the security tail by using constant weight t-EC/AUED codes. It is shown that our method has the smaller tail than the previously developed coding approach in [1]. This paper also defines a new class of code with tampering detecting capability, and the code of tampering detection in [1] is only a special case in the new class of code.