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Thread: srm command questions

  1. #1
    Join Date
    Sep 2007
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    41

    srm command questions

    I was looking around the net for an Ubuntu/Linux equivalent of the Eraser program on Windows. I found out about the srm command, but I have a few questions:

    1. How many times is it overwriting the target file/files?
    2. Is it using pseudo-random data or successive paths of ones and zeroes?
    3. Is there another command that is better for what i am looking to do?

  2. #2
    Join Date
    Sep 2007
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    41

    Re: srm command questions

    Maybe this should be moved to the security forum?

  3. #3
    Join Date
    Feb 2007
    Beans
    847

    Re: srm command questions

    Code:
    man srm
    Code:
           -m, --medium
                  overwrite the file with 7 US DoD compliant passes  (0xF6,  0x00,
                  0xFF, random, 0x00, 0xFF, random)
    Code:
           The -s option overrides the -m option, if both are present.  If neither
           is specified, the 35-pass Gutmann algorithm is used.

  4. #4
    Join Date
    Sep 2007
    Beans
    41

    Re: srm command questions

    Damn..I could swear I checked the man page earlier and it didn't have that info. Thanks for pointing me to it (again!).

  5. #5
    Join Date
    Sep 2007
    Beans
    41

    Re: srm command questions

    I was reading other forums posts and one of the things that was brought up was a journaling file system like ext3 cannot be securely deleted using srm.

    After reading many, many other posts I am coming to the conclusion that a combination of today's large hard drives, cheaper equipment, and journaling file systems, it is almost impossible to securely erase your data.

    I know TrueCrypt has whole drive encryption for a Windows machine and one of the action items is to create whole drive encryption for Linux. Does anyone do this currently?

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