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Re^7: Opening an Encrypted DB_File database

by hardburn (Abbot)
on Jul 15, 2004 at 14:27 UTC ( #374660=note: print w/replies, xml ) Need Help??


in reply to Re^6: Opening an Encrypted DB_File database
in thread Opening an Encrypted DB_File database

128 bits is still strong and will be for the forseeable future, excepting a sudden mathmatical breakthrough. Further, the cost to brute force rises exponentially with the keysize and can easily outpace Moore's Law.

You would do well to pick up a copy of "Applied Cryptography" (or "Practical Cryptography", which is sort of the updated version, but I haven't read it myself yet). In particular, you may find the chapter on combining ciphers enlightening. You can't just put two 256-bit ciphers together and get a 512-bit cipher. IIRC, you're not worse off (security-wise) than if you had only used one cipher, but you're probably no better off, either. It's possible to combine ciphers, but it has to be done carefuly.

----
send money to your kernel via the boot loader.. This and more wisdom available from Markov Hardburn.

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Re^8: Opening an Encrypted DB_File database
by crabbdean (Pilgrim) on Jul 15, 2004 at 17:46 UTC

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Discipulus a missing semicolon after use LWP::UserAgent caused very strange behaviour and not the normal warning...
[choroba]: Yes, sometimes missing ; after the use clause just interprets the next line somehow and passes the result to the used module which could happily ignore it. Been there, seen that.
[Discipulus]: luckly the program was 20 lines!

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