miller@loral.UUCP (BIG DAVE) (02/24/90)
Does anyone know a way of protecting the data that's been stored in a 2764,
8KX8, EPROM ?. Is there a way of safegarding data stored in such devices
once one gives the device to someone else ?. I read the spec sheets and found
no provisions for 'security bits', ala PALs, so I'm curious as to how one might
get around to solving such a problem. I would greately appreciate any help in
this matter.
Thanks in advanced, BIG DAVE.
David P. Miller - Loral Instrumentation.
8401 Aero Drive, San Diego, California 92123 / USUAL \
(619) 560-5888 USA \ DISCLAIMER /
miller@loral.cts.com
********************************************************************************
"Uma vez Flamengo, sempre Flamengo. Flamengo sempre eu hei de ser ..."dnelson@mthvax.cs.miami.edu (Dru Nelson) (02/24/90)
In article <2446@loral.UUCP> miller@loral.UUCP (BIG DAVE) writes: >Does anyone know a way of protecting the data that's been stored in a 2764, >8KX8, EPROM ?. Is there a way of safegarding data stored in such devices Is this a joke posting that I haven't been told about? (like the WOM chip) If not, I think this is a great example of how the signal to noise ratio on the internet is becoming :-). Seriously though, if you want to protect your data, you should contact Nintendo or Tengen. -- %% Dru Nelson %% Miami, FL %% Internet: dnelson@mthvax.cs.miami.edu %%
deraadt@cpsc.ucalgary.ca (Theo Deraadt) (02/25/90)
In article <2446@loral.UUCP>, miller@loral.UUCP (BIG DAVE) writes: > Does anyone know a way of protecting the data that's been stored in a 2764, > 8KX8, EPROM ?. Is there a way of safegarding data stored in such devices > once one gives the device to someone else ?. I read the spec sheets and found > no provisions for 'security bits', ala PALs, so I'm curious as to how one > might ....... thank you for making my belly ache... feels good.. Seriously, see if you can get a processor in the same family that has an eprom available on chip. Many do have lock bits. <tdr. SunOS 4.0.3: /usr/include/vm/as.h, Line 44 | Theo de Raadt Is it a typo? Should the '_' be an 's'?? :-) | deraadt@enme.ucalgary.ca
henry@utzoo.uucp (Henry Spencer) (02/25/90)
In article <2446@loral.UUCP> miller@loral.UUCP (BIG DAVE) writes: >Does anyone know a way of protecting the data that's been stored in a 2764, >8KX8, EPROM ?. Is there a way of safegarding data stored in such devices >once one gives the device to someone else ?. I read the spec sheets and found >no provisions for 'security bits', ala PALs... Um, how could such a protected EPROM function? The *purpose* of memory chips is to yield their contents on demand. If a snooper can't read your EPROM, the CPU that is supposed to run code from it can't either. -- "The N in NFS stands for Not, | Henry Spencer at U of Toronto Zoology or Need, or perhaps Nightmare"| uunet!attcan!utzoo!henry henry@zoo.toronto.edu
hoang@rex.cs.tulane.edu (Dzung Hoang) (02/25/90)
In article <1990Feb24.151348.29738@mthvax.cs.miami.edu> dnelson@mthvax.cs.miami.edu (Dru Nelson) writes: >In article <2446@loral.UUCP> miller@loral.UUCP (BIG DAVE) writes: >>Does anyone know a way of protecting the data that's been stored in a 2764, >>8KX8, EPROM ?. Is there a way of safegarding data stored in such devices > > Is this a joke posting that I haven't been told about? (like the WOM chip) > > If not, I think this is a great example of how the signal to noise ratio > on the internet is becoming :-). > > Seriously though, if you want to protect your data, you should contact > Nintendo or Tengen. On the serious side, if by "protection," the original poster means write/erase protection, then there are one-time programmable (OTP) versions of certain 27XXX EPROMs. I saw ones for the 27128 and up but not for the 2764. Other ways to protect the EPROM is to put an piece of opaque tape over the round window. Dzung Hoang -- ----------------------------------------------------------------------------- hoang@comus.cs.tulane.edu hoang@rex.cs.tulane.edu hoang@comus.UUCP hoang@rex.UUCP tulane!comus!hoang tulane!rex!hoang -----------------------------------------------------------------------------
grege@gold.GVG.TEK.COM (Gregory Ebert) (02/27/90)
In article <2446@loral.UUCP> miller@loral.UUCP (BIG DAVE) writes: >Does anyone know a way of protecting the data that's been stored in a 2764, Try swapping around a few addr an/or data lines. It won't prevent someone from copying it, but will make it harder to use. A security fuse cannot protect a ROM - after all, the CPU must get the data somehow. I can sell you a large quantity of write-only memories - under 10mW, 1Megx8, 100nsec for a good price.... :)
brian@ucsd.Edu (Brian Kantor) (02/27/90)
In article <2446@loral.UUCP> miller@loral.UUCP (BIG DAVE) writes: >Does anyone know a way of protecting the data that's been stored in a 2764, >8KX8, EPROM ?. Is there a way of safegarding data stored in such devices >once one gives the device to someone else ?. I read the spec sheets and found >no provisions for 'security bits', ala PALs, so I'm curious as to how one might >get around to solving such a problem. I would greately appreciate any help in >this matter. Depends on what you're trying to protect. If you want to keep people from duplicating the ROM, you're out of luck. If you want people not to be able to read the data out of the rom and use it some other way, you can make it a little harder. You can store your data in encrypted form, and have the decryption performed based on a user-entered key, without which the system won't work. Anyone with the key has your info. You can scramble the address and data lines, which will prevent the data from being quite so easily read out from the raw chip, but won't stop anyone who has access to the device it's installed in. Essentially, because any piece of hardware is a closed system, outside of autodestruct mechanisms there is nothing you can do to stop someone who is determined enough from figuring out how it works. All you can do is make it cost them more. - Brian
markz@ssc.UUCP (Mark Zenier) (02/28/90)
In article <2446@loral.UUCP>, miller@loral.UUCP (BIG DAVE) writes: > Does anyone know a way of protecting the data that's been stored in a 2764, > 8KX8, EPROM ?. Is there a way of safegarding data stored in such devices > once one gives the device to someone else ?. I read the spec sheets and found >no provisions for 'security bits', ala PALs, so I'm curious as to how one might > get around to solving such a problem. I would greately appreciate any help in > this matter. If you want a portable source of protected data, you could try the Dallas Semiconductor DS5000 (if it exists yet). It's a 8051 with a battery backup ram (8k or 32K bytes), with a decrypter in the program fetch. "When activated, the device loads and executes the software in an encrypted form, rendering the contents of the RAM and the execution of the program unintelligible to the outside observer. ... Any attempt to discover the key value results in its erasure, rendering the contents of the Program/Data RAM useless." The datasheet is marked Preliminary, so I don't know if its real yet. Its the most paranoid part I've seen on the commercial market. markz@ssc.uucp
topgun@chaos.cs.brandeis.edu (Chandra Bajpai) (03/01/90)
In article <1990Feb24.151348.29738@mthvax.cs.miami.edu> dnelson@mthvax.cs.miami.edu (Dru Nelson) writes: >In article <2446@loral.UUCP> miller@loral.UUCP (BIG DAVE) writes: >>Does anyone know a way of protecting the data that's been stored in a 2764, >>8KX8, EPROM ?. Is there a way of safegarding data stored in such devices > > Seriously though, if you want to protect your data, you should contact > Nintendo or Tengen. > How does Nintendo protect their programs or prevent other non-Nindento programs from running? What type of mechanism is this?