Various systems, methods, and computer program products are provided for complex data encryption. The method includes receiving a user input code from a computing device associated with a user. The user input code is one or more plaintext characters. The method also includes generating a first encrypted value using a first encryption algorithm based on the user input code. The method further includes decrypting the first encrypted value using one or more additional encryption algorithms. The one or more synthetic user input codes are generated by the decryption of the first encrypted value using each of the one or more additional encryption algorithms. The method still further includes determining a first encryption vulnerability score based on the value of the one or more synthetic user input codes. The method also includes causing a transmission of a user input code notification based on the first encryption vulnerability score.