These earlier cryptographic systems are also referred to as Ciphers. Unlike modern systems which are digital and treat data as binary numbers, the earlier systems worked on alphabets as basic element. The only security service these systems provide is confidentiality of information. Earlier Cryptographic Systemsīefore proceeding further, you need to know some facts about historical cryptosystems −Īll of these systems are based on symmetric key encryption scheme. In this chapter, we discuss this technique further and its applications to develop various cryptosystems. One of these tools is the Symmetric Key Encryption where the key used for encryption and decryption is the same. We equated cryptography with a toolkit where various cryptographic techniques are considered as the basic tools. In the second chapter, we discussed the fundamentals of modern cryptography.
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