Re: DRAM data persistence

On Jul 2, 6:30 pm, MooseFET <kensm...@xxxxxxxxx> wrote:
On Jul 2, 4:34 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?

I have also seen it happen in static RAM. The data bits are not
accurately remembered but there is a strong bias towards them waking
up in the same state they were at power down.

I guess if someone can have access to the RAM every night after you go
home, they may be able to reconstruct something of what you work on
during the day.

Any suggestions on how to clear the remnants if one does not have the
time to overwrite the whole memory?


.

Relevant Pages

  • Re: DRAM data persistence
    ... data could partially persist in the DRAM cells through a power-off/ ... I have also seen it happen in static RAM. ... up in the same state they were at power down. ... Any modern OS clears the memory before freeing it for use ...
    (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. ... 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. ... 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)
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