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Re: BAD ADVICE WARNING from Kent: Access to Storage and Communication
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In <[email protected]>, on 06/10/97
at 09:35 PM, [email protected] (Igor Chudov @ home) said:
>Dr.Dimitri Vulis KOTM wrote:
>> Ray Arachelian <[email protected]> writes:
>> > Passphrases can be memorized. 4mm DAT tapes hold several gigs and are
>> > tiny. Ever see one? Fits in your pocket. It's smaller that an audio
>> > cassette. Fairly easy to guard, but, if your data is backed up in
>> > encrypted form (cyphertext), and not clear text, you don't even need to
>> > bother protecting the tape. (That is unless your backup software uses a
>> > weak cypher as most tend to do.) [FYI: Your knowledge of tape
>> > technologies is severly lacking. 4mm tapes hold 2-4Gb. Exabytes 5Gb-10Gb.
>> > Mamouth Exabytes (same size as 8mm camcorder video tapes, smaller than
>> > audio cassettes) hold as much as 40Gb in a very small form factor.]
>>
>> I'm actually thinking of getting a pair of 4mm tape drives to replace
>> my existing backup system (very old drives that use DC 600As; only
>> .25GB / drive, pretty slow, no NT drivers; time to upgrade)
>>
>> I wonder: if the data is well-encrypted, wouldn't it make the compression
>> pretty ineffective?
>You can compress before the encryption (if the encryption algorithm does
>not do compression).
>tar cvfz - /directory | Encrypt > /dev/ftape
>or something like that.
>Another thing to worry about is being able to at least partially restore
>data if one or several blocks get corrupted.
Well for backup purposes one would probably want to do their encryption on
a block size < file size. As an example for a 1M file you could encrypt it
as 10 seperate 100k blocks (or any suitable block size) rather than
encrypting the entire file in one block. I have programs on my system that
will do this for me but it would be best if all of this was built into the
backup software.
Myself I don't use tape. I use mirrored HD's and MO's & CD for short &
long term archives.
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