Re: DRAM data persistence

From: z <gzuckier@xxxxxxxxxxxxxx>
Date: Mon, 09 Jul 2007 10:22:09 -0700

On Jul 2, 7:34 pm, Richard Henry <pomer...@xxxxxxxxxxx> wrote:

I remember years ago hearing about a security problem with DRAM, that
data could partially persist in the DRAM cells through a power-off/
power-on cycle and might be retireved by careful application of power
and reading of the DRAM contents. Does anyone remember details of
this?

Nope, but like 20 years ago we found a program for the IBM PC which
allowed you to set the memory refresh rate, so we were fooling around
to see how long the memory could hold data without being refreshed,
and we were amazed to see it was on the order of a few seconds.

.

Follow-Ups:
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  - From: Paul Hovnanian P.E.
- Re: DRAM data persistence
  - From: Vladimir Vassilevsky

References:
- DRAM data persistence
  - From: Richard Henry

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Re: DRAM data persistence
... data could partially persist in the DRAM cells through a power-off/ ... and reading of the DRAM contents. ... Ages ago, when RAM was PMOS, one of the Intel chips was so well made that selected chips could store data for a few days without power. ...
(sci.electronics.design)
Re: DRAM data persistence
... data could partially persist in the DRAM cells through a power-off/ ... and reading of the DRAM contents. ... I have also seen it happen in static RAM. ... up in the same state they were at power down. ...
(sci.electronics.design)
Re: DRAM data persistence
... data could partially persist in the DRAM cells through a power-off/ ... and reading of the DRAM contents. ... up in the same state they were at power down. ... the computer frees all memory so all memory is cleared before you can ...
(sci.electronics.design)
Re: DRAM data persistence
... data could partially persist in the DRAM cells through a power-off/ ... and reading of the DRAM contents. ... I have also seen it happen in static RAM. ... up in the same state they were at power down. ...
(sci.electronics.design)
Re: DRAM data persistence
... data could partially persist in the DRAM cells through a power-off/ ... up in the same state they were at power down. ... This is in fact an attack on crypto systems using CMOS memories. ...
(sci.electronics.design)