DCT4 Decryption/Encryption Algorithm - Page 2 - GSM-Forum

ulymar · 05-12-2006, 20:51

Soon be added, change of language or anything you want....

ben_whiteus · 05-13-2006, 17:10

g3gg0 and nok5rev had already provide the program (with source code) to decrypt DCT4 MCU flash files. Refer to http://forum.gsmhosting.com/vbb/showthread.php?t=259170.

From my understanding (to be confirmed), DCT4 PPM file is not encrypted, they are merely compressed.

krisha · 05-19-2006, 18:22

yes, most newer ppm's are NOT encrypted.

you can decompress it somehow or use nokia's internal decompressor and dump it over a FBUS patched firmware

http://www.gsmfreeboard.com/forum/sh...d.php?t=125478

thefoxes · 05-31-2006, 11:19

Krisha. Is it possbile that if i have a PMM (PM) file from a Nokia 7250 that i could decrypt/uncompress the file to extract an SMS from it. I am desperate to retrieve a deleted SMS that was on the phone

Thanks for any help

willy · 05-31-2006, 12:16

>>?e,00,10,f1,00,0a,00,1d,d0,01,00,7f,00,00,18,0 1,
<<?4,10,18,d6,00,06,01,00,02,7c,7c,1e,
<<?4,10,18,d6,00,06,01,00,01,00,00,1e,
<<?4,10,18,d6,00,06,01,00,02,00,00,1e,
<<?4,10,18,d6,00,06,01,00,01,7c,7c,1e,
<<?e,10,7c,f1,00,ce,1d,14,d0,01,00,18,f0,f0,00,02, ff,ff,ff,fc,00,00,00,00,ff,ff,ff,ff,ff,ff,ff,ff,ff ,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,f f,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff, ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff ,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,f f,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff, ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff ,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,f f,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff, ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff ,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,f f,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,

from "007f0000" start to read
just have fun
willy

g3gg0 · 05-31-2006, 13:34

@thefoxes:
PPM != PM

thefoxes · 06-01-2006, 07:47

Thanks g3gg0, Its just that some people reference the permanent memory file as PM or PMM... will i think my understanding is right. What i have looking for is any help in decoding this . The file if opened in a text editor is broken into sections, with each section containing one or more entries. I know section 35 is the security code, fine no problem . But what are the other sections and what coding they are in (7Bit, 8Bit?)

Thanks

Dave.W · 06-01-2006, 14:00

yes thefoxes, you are thinking on PM (PMM) which is permanent memory.

it is not crypted (on a whole) and can read easilly with twister flasher or JAF box. this gives you the text file to open.

the sections, are many things. calibration data, network specific data, user stored data (for example your ringtone selection is stored to the PM. even SP_lock data is stored to the PM.

basically it is the phone eeprom, if you know what that does.

the guy says PM!=ppm because PMM and PPM are two very different thing.

PPM is post programmable memory. it is language data, text string, inbuilt ringtone.

these guy are all working on PPM, not PMM so they are no help to you

best to just read all PM from the phone and look through it with notepad

thefoxes · 06-01-2006, 15:34

Thanks Dave,

Yes i have the PM file and can read in a text viewer. I know the section 35 is the security code, the SMS section is in this file but the coding for fits the stanadrd GSM SMS coding (PDU coding type). What i am after is if somebody outthere knows what each section in the PM file does and what it is and then try and decifer each section. A. it would be nice to get an SMS back that i lost. B. Its a great project i am working on for University.

Surley it could be possible to extract this a read with a developed application

Thanks

Dave.W · 06-02-2006, 09:48

i did not realize it was encoded man. in the dct3 nokia, you could just read the eeprom and open file in hex editor. in there was displayed the sms messages (including recent deleted) stored in plain text...

ulymar · 06-04-2006, 09:28

@thefoxes

pm contains hex data, just convert it in ascii.

hope it can help you.

regards.

ghosthacker · 06-06-2006, 16:25

Quote:

Originally Posted by ulymar

@thefoxes

pm contains hex data, just convert it in ascii.

hope it can help you.

regards.

i'm interssting on it but your link didn't work: http://www.gsmgadget.cjb.net/showthread.php?t=514

workaround · 12-10-2006, 15:49

Great info, very useful.

.:VodaFone:. · 04-15-2007, 07:30

Quote:

Originally Posted by ulymar

why not try this link:

http://www.gsmgadget.cjb.net/showthread.php?t=514

Hi,
Please upload DCT4 Mods Testing here:

Bell666 · 12-06-2017, 20:20

Wow. Willy left in 2006. It's now 2017.

05-31-2006, 11:19	#19 (permalink)
thefoxes Freak Poster Join Date: Aug 2005 Age: 52 Posts: 124 Member: 174847 Status: Offline Thanks Meter: 5	Krisha. Is it possbile that if i have a PMM (PM) file from a Nokia 7250 that i could decrypt/uncompress the file to extract an SMS from it. I am desperate to retrieve a deleted SMS that was on the phone Thanks for any help Last edited by thefoxes; 06-01-2006 at 15:36.

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05-12-2006, 20:51	#16 (permalink)
ulymar Product Supporter Join Date: Sep 2004 Location: PHILIPPINES Age: 46 Posts: 686 Member: 81952 Status: Offline Sonork: 1597268 Thanks Meter: 2,364	Soon be added, change of language or anything you want....

05-13-2006, 17:10	#17 (permalink)
ben_whiteus Crazy Poster Join Date: Jun 2005 Posts: 54 Member: 152989 Status: Offline Thanks Meter: 11	g3gg0 and nok5rev had already provide the program (with source code) to decrypt DCT4 MCU flash files. Refer to http://forum.gsmhosting.com/vbb/showthread.php?t=259170. From my understanding (to be confirmed), DCT4 PPM file is not encrypted, they are merely compressed.

05-19-2006, 18:22	#18 (permalink)
krisha Junior Member Join Date: May 2005 Posts: 6 Member: 142832 Status: Offline Thanks Meter: 1	yes, most newer ppm's are NOT encrypted. you can decompress it somehow or use nokia's internal decompressor and dump it over a FBUS patched firmware http://www.gsmfreeboard.com/forum/sh...d.php?t=125478

05-31-2006, 12:16	#20 (permalink)
willy No Life Poster Join Date: Mar 2000 Location: inside NOKIA phone Age: 58 Posts: 1,677 Member: 1060 Status: Offline Thanks Meter: 10	>>?e,00,10,f1,00,0a,00,1d,d0,01,00,7f,00,00,18,0 1, <<?4,10,18,d6,00,06,01,00,02,7c,7c,1e, <<?4,10,18,d6,00,06,01,00,01,00,00,1e, <<?4,10,18,d6,00,06,01,00,02,00,00,1e, <<?4,10,18,d6,00,06,01,00,01,7c,7c,1e, <<?e,10,7c,f1,00,ce,1d,14,d0,01,00,18,f0,f0,00,02, ff,ff,ff,fc,00,00,00,00,ff,ff,ff,ff,ff,ff,ff,ff,ff ,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,f f,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff, ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff ,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,f f,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff, ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff ,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,f f,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff, ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff ,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,f f,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff,ff, from "007f0000" start to read just have fun willy

05-31-2006, 13:34	#21 (permalink)
g3gg0 Insane Poster Join Date: Apr 2004 Location: no Posts: 73 Member: 61288 Status: Offline Thanks Meter: 45	@thefoxes: PPM != PM

06-01-2006, 07:47	#22 (permalink)
thefoxes Freak Poster Join Date: Aug 2005 Age: 52 Posts: 124 Member: 174847 Status: Offline Thanks Meter: 5	Thanks g3gg0, Its just that some people reference the permanent memory file as PM or PMM... will i think my understanding is right. What i have looking for is any help in decoding this . The file if opened in a text editor is broken into sections, with each section containing one or more entries. I know section 35 is the security code, fine no problem . But what are the other sections and what coding they are in (7Bit, 8Bit?) Thanks

06-01-2006, 14:00	#23 (permalink)
Dave.W No Life Poster Join Date: Nov 2001 Location: England Age: 41 Posts: 2,821 Member: 7653 Status: Offline Thanks Meter: 823	yes thefoxes, you are thinking on PM (PMM) which is permanent memory. it is not crypted (on a whole) and can read easilly with twister flasher or JAF box. this gives you the text file to open. the sections, are many things. calibration data, network specific data, user stored data (for example your ringtone selection is stored to the PM. even SP_lock data is stored to the PM. basically it is the phone eeprom, if you know what that does. the guy says PM!=ppm because PMM and PPM are two very different thing. PPM is post programmable memory. it is language data, text string, inbuilt ringtone. these guy are all working on PPM, not PMM so they are no help to you best to just read all PM from the phone and look through it with notepad

06-01-2006, 15:34	#24 (permalink)
thefoxes Freak Poster Join Date: Aug 2005 Age: 52 Posts: 124 Member: 174847 Status: Offline Thanks Meter: 5	Thanks Dave, Yes i have the PM file and can read in a text viewer. I know the section 35 is the security code, the SMS section is in this file but the coding for fits the stanadrd GSM SMS coding (PDU coding type). What i am after is if somebody outthere knows what each section in the PM file does and what it is and then try and decifer each section. A. it would be nice to get an SMS back that i lost. B. Its a great project i am working on for University. Surley it could be possible to extract this a read with a developed application Thanks

06-02-2006, 09:48	#25 (permalink)
Dave.W No Life Poster Join Date: Nov 2001 Location: England Age: 41 Posts: 2,821 Member: 7653 Status: Offline Thanks Meter: 823	i did not realize it was encoded man. in the dct3 nokia, you could just read the eeprom and open file in hex editor. in there was displayed the sms messages (including recent deleted) stored in plain text...

06-04-2006, 09:28	#26 (permalink)
ulymar Product Supporter Join Date: Sep 2004 Location: PHILIPPINES Age: 46 Posts: 686 Member: 81952 Status: Offline Sonork: 1597268 Thanks Meter: 2,364	@thefoxes pm contains hex data, just convert it in ascii. hope it can help you. regards.

12-10-2006, 15:49	#28 (permalink)
workaround Temporary banned !! Join Date: Jun 2006 Posts: 119 Member: 287892 Status: Offline Thanks Meter: 1	Great info, very useful.

12-06-2017, 20:20	#30 (permalink)
Bell666 No Life Poster Join Date: Feb 2012 Posts: 762 Member: 1718440 Status: Offline Thanks Meter: 620	Wow. Willy left in 2006. It's now 2017.