Abstract: In our communication system, security is an important factor. Secured communication assists to protect the confidentiality of data. Secured communication can be obtained by encrypting the data. Cryptography is one method of encrypting our message or information. Fundamentally, the problem lies on the inherent contradiction between testability and security for digital circuits. Hence, there’s a need for an efficient solution such that both testability and security are satisfied. Several secure scan techniques exist. Of which the modified scan design of Shatterproof secure scan makes it more difficult to discover the internal scan architecture. Thus a modified scan design which ensures higher level of security is explained in this paper.

Keywords: Cryptography, secure scan, testability.