Post by David Higton
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
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.