I just constructed a test and found the way the list is stored in bytecode will allow it to be display as characters in HEXDUMP -C as you found.I am not convinced that's enough obfuscation to hide secrets using MicroPython. I haven't built a full MicroPython to test but I believe the bytecode generated should be the same whether included in a full build as it is from using 'mpy-cross' to create a '.mpy' file.
Code:
#------------------------------------------------------------------------# RECOMPOSE(LIST) - Recreate the string decomposed from DECOMPOSE(STRING)def recompose(eval_list): # Input must be of type LIST rtn="" for c in eval_list: rtn=rtn+chr(c) return rtn#------------------------------------------------------------------------# Main Line# Set Parametersfrom_email=recompose([112,97,117,108,64,115,111,109,101,100,111,109,97,105,110,46,99,111,109])to_email= from_emailprint(to_email)email_pass=recompose([49,50,51,52,115,111,109,101,70,97,110,99,121,80,97,115,115,119,111,114,100,33,64,42,35])print(email_pass)Code:
$ hexdump -C uPy_test.mpy00000000 4d 06 00 1f 0a 00 1a 2e 2f 75 50 79 5f 74 65 73 |M......./uPy_tes|00000010 74 2e 70 79 00 0f 12 72 65 63 6f 6d 70 6f 73 65 |t.py...recompose|00000020 00 03 14 66 72 6f 6d 5f 65 6d 61 69 6c 00 10 74 |...from_email..t|00000030 6f 5f 65 6d 61 69 6c 00 81 77 14 65 6d 61 69 6c |o_email..w.email|00000040 5f 70 61 73 73 00 12 65 76 61 6c 5f 6c 69 73 74 |_pass..eval_list|00000050 00 81 09 8a 7c c8 10 18 01 60 84 0c 1f 1f 21 24 |....|....`....!$|00000060 27 1f 1f 2b 32 00 16 02 11 02 22 80 70 22 80 61 |'..+2.....".p".a|00000070 22 80 75 22 80 6c 22 80 40 22 80 73 22 80 6f 22 |".u".l".@".s".o"|00000080 80 6d 22 80 65 22 80 64 22 80 6f 22 80 6d 22 80 |.m".e".d".o".m".|00000090 61 22 80 69 22 80 6e ae 22 80 63 22 80 6f 22 80 |a".i".n.".c".o".|000000a0 6d 2b 13 34 01 16 04 11 04 16 05 11 06 11 05 34 |m+.4...........4|000000b0 01 59 11 02 22 31 22 32 22 33 22 34 22 80 73 22 |.Y.."1"2"3"4".s"|000000c0 80 6f 22 80 6d 22 80 65 22 80 46 22 80 61 22 80 |.o".m".e".F".a".|000000d0 6e 22 80 63 22 80 79 22 80 50 22 80 61 22 80 73 |n".c".y".P".a".s|000000e0 22 80 73 22 80 77 22 80 6f 22 80 72 22 80 64 a1 |".s".w".o".r".d.|000000f0 22 80 40 aa a3 2b 19 34 01 16 07 11 06 11 07 34 |".@..+.4.......4|00000100 01 59 51 63 01 81 68 49 0e 02 08 60 20 23 25 4a |.YQc..hI...` #%J|00000110 10 03 c1 b0 5f 4b 0b c2 b1 12 09 b2 34 01 f2 c1 |...._K......4...|00000120 42 33 b1 63 |B3.c|00000124Statistics: Posted by DS256 — Thu Apr 10, 2025 8:30 pm