A method and a system for encrypting data by a data protection system are provided. The data protection system may receive one or more dataset and calculate the number of binary digit ‘1’ in each byte of the one or more dataset. Further, it may determine a slot value for each byte of the one or more dataset based on location of the each byte in a table of the plurality of tables. And, it may identify a pattern index for the each byte based on the location of the each byte in the one or more slots and generates an encrypted byte for the each byte of the one or more dataset. The data protection system may further decrypt the encrypted dataset by receiving one or more encrypted byte.