Enhancement of Caesar Cipher Algorithm using Four Keys

There are serious worries about possible cybersecurity risks and the necessity for reliable solutions as the Internet of Things (IoT) becomes more integrated into our daily lives. IoT security is crucial to preserving the privacy and accuracy of user data. Nowadays, cryptography is a key component of information security systems' defense against hostile attacks. The Caesar cipher is one of the most popular encryption-decryption methods. The encrypted text is evolved by the use of a substitution method. This type of replacement cipher uses a key, which is a numerical value, to split the letters and replaces each letter in the plaintext with a letter at a predetermined moment. The goal of this research is to create a technique with a higher level of security than the original algorithm. It suggests altering the encryption algorithm for the Caesar cipher, which would complicate the procedure. The Caesar cipher has been improved by using extended ASCII code instead of ASCII code, in addition to adding alphabets, integers, and symbols. Additionally, we use four different keys (Key1, Key2, Key3, and Key4) to illustrate the efficacy of the proposed method. The length of the primary key is 128 bits. It has been split into four halves, or four keys, each of which has a key length of 32 bits. The encryption strength of the modified Caesar cipher was assessed using the Brute Force attack, which was then compared to the Caesar method. The results showed that the Caesar method was broken and that the value of the key used in the encryption process was discovered, despite the fact that the proposed algorithm was unknown and revealed the value of the encryption key.