(gdb) info functions
All defined functions:

Non-debugging symbols:
0x56556000  _init
0x56556030  printf@plt
0x56556040  gets@plt
0x56556050  puts@plt
0x56556060  __libc_start_main@plt
0x56556070  __cxa_finalize@plt
0x56556080  _start
0x565560c0  __x86.get_pc_thunk.bx
0x565560d0  deregister_tm_clones
0x56556110  register_tm_clones
0x56556160  __do_global_dtors_aux
0x565561b0  frame_dummy
0x565561b5  __x86.get_pc_thunk.dx
0x565561b9  hacker
0x565561e4  inSecure
0x56556233  main
0x5655624f  __x86.get_pc_thunk.ax
0x56556260  __libc_csu_init
0x565562c0  __libc_csu_fini
0x565562c4  _fini