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Re^6: Opening an Encrypted DB_File database

by crabbdean (Pilgrim)
on Jul 15, 2004 at 11:47 UTC ( #374617=note: print w/replies, xml ) Need Help??

in reply to Re^5: Opening an Encrypted DB_File database
in thread Opening an Encrypted DB_File database

Yeah, a bit of overkill but looking forward I considered that a year ago 128 bit used to be considered strong, whereas, a year later its not. Yeah, the password bit is the weakpoint but I'm not sure how to strengthen that. I have to consider that a users must get into the program somehow (relatively easily) but also consider that IF a hacker got in they'd then have access to ALL their passwords. Its needs a good strong front door. :-) Any ideas are welcome.

Also, how did you derive 10^16? Just curious. Thanks again.

The Funkster of Mirth
Programming these days takes more than a lone avenger with a compiler. - sam
RFC1149: A Standard for the Transmission of IP Datagrams on Avian Carriers
  • Comment on Re^6: Opening an Encrypted DB_File database

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Re^7: Opening an Encrypted DB_File database
by hardburn (Abbot) on Jul 15, 2004 at 14:27 UTC

    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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