Hi,
in sector oriented file systems, files slightly larger than sector size
(or some other base unit) usually cause unused (waste) space in a file
system. LEDE uses compressed file systems. Is there any such thing as
a "sector size" in LEDE one may take into account
i) when creating files while running LEDE
ii) when placing files in an image using the image generator?
An example are client keys stored in /etc/dropbear/authorized_keys.
Here are some numbers for RSA client keys:
private key length public key file length
2048 bits ca. 400 bytes
2600 bits ca. 500 bytes
3000 bits ca. 550 bytes
For uncompressed file systems with a sector size of 512 bytes, client
key length of 2600 bits looks like a good compromise between security
margin and memory consumption. But how does that reasoning translate to
LEDE (OpenWrt)? Targeting memory constrained devices, say, 4 MB Flash +
16 MB RAM, is there any advantage in tuning file length to
some file system characteristics?
Best regards,
Stephan Hennig
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