Alice sends public key: (0, 109790246752332785586117900442206937983841168568097606235725839233151034058387)
Bob sends public key: (0, 45290526009220141417047094490842138744068991614521518736097631206718264930032)

Alice sends encrypted_flag: {'iv': '31068e75b880bece9686243fa4dc67d0', 'encrypted_flag': 'e2ef82f2cde7d44e9f9810b34acc885891dad8118c1d9a07801639be0629b186dc8a192529703b2c947c20c4fe5ff2c8'}