Abstract
Nowadays, cryptosystems can be applied in several areas in life. One of them is in transaction data. In transaction data, a very strong cryptosystem is needed so that the transaction data is safe. Cryptosystems are better with a strong keystream. In this case, we use rainbow antimagic as a cryptosystem key to improve the robustness of the keystream by using affine cipher. The algorithm uses the edge weights of rainbow antimagic vertex labeling of graphs as a key for encryption and decryption. In this paper, we found the rainbow antimagic connection number of tadpole graphs and two algorithms to straighten affine ciphers.
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