Authors - Sapna Jyoti Patel, Sumit Kumar Debnath Abstract - This paper analyses the blindness property of two code-based blind signature schemes: one by Chen et al. [17] and the other one by Ren et al. [19]. Both [17] and [19] claimed that their protocols provide blindness under brute force attacks. Through detailed analysis, this paper demonstrates that the aforementioned code-based blind signature schemes (CBBSS), in practice, do not satisfy the property of blindness. Moreover, we use a zero-knowledge proof of knowledge (ZKPK) in [17] and [19] in order to achieve the blindness property.
