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Groups > comp.sys.acorn.programmer > #5615

Re: Blowfish encryption

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In message <20f9995d57.DaveMeUK@my.inbox.com>
          David Higton <dave@davehigton.me.uk> wrote:

>There has been an interesting discussion in csa.apps recently about
>encryption, and producing encrypted copies of files.  The discussion
>has moved from apps to programmer territory, so I've started this
>thread to collect useful info.  It has potential to help more people,
>hence this rather than private mail.

I've just done a test to encrypt and decrypt a file of a little
under 2 GB, on a BBxM.  The source is on NAS accessed via LanMan98;
the encrypted and decrypted files are on an SSD connected via USB.
Encryption and decryption were performed in 32 kiB chunks.

The time to encrypt was 948.62 seconds, and the time to decrypt
was 1264.01 seconds.

I know from previous experiments that the encryption and decryption
times are roughly 90% file handling and only about 10% are the
encryption and decryption, and that encryption and decryption take
similar times (not surprising since the algorithms are almost
identical).

I think it was really interesting that LM98 -> SSD was much faster
than SSD -> SSD, although it may be that the SSD was slowed down by
having to deal with a read file and a write file at the same time.

Dave

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Thread

Blowfish encryption David Higton <dave@davehigton.me.uk> - 2018-11-27 16:34 +0000
  Re: Blowfish encryption Martin <News03@avisoft.f9.co.uk> - 2018-11-27 18:03 +0000
    Re: Blowfish encryption David Higton <dave@davehigton.me.uk> - 2018-11-27 19:39 +0000
      Re: Blowfish encryption Dave Symes <dave@triffid.co.uk> - 2018-11-27 19:47 +0000
        Re: Blowfish encryption David Higton <dave@davehigton.me.uk> - 2018-11-27 21:31 +0000
      Re: Blowfish encryption David Higton <dave@davehigton.me.uk> - 2018-11-27 22:22 +0000
      Re: Blowfish encryption Martin <News03@avisoft.f9.co.uk> - 2018-11-27 22:12 +0000
        Re: Blowfish encryption Kevin Wells <kev@kevsoft.co.uk> - 2018-11-28 15:38 +0000
          Re: Blowfish encryption David Higton <dave@davehigton.me.uk> - 2018-11-28 21:16 +0000
  Re: Blowfish encryption David Higton <dave@davehigton.me.uk> - 2018-11-28 21:27 +0000

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