Thanks.
On Wed, Mar 13, 2013 at 10:56 AM, Erwann Abalea <erwann.aba...@keynectis.com> wrote: > The algorithm "Rijndael" has some knobs you can turn to tune. > The standard "AES" has these parameters fixed in stone. > > AES-192 is effectively "less secure" than AES-256 because of the key length > and number of rounds. > But "less secure" may be "secure enough". In fact, AES-128 is secure enough > for most uses. > Number of rounds is important for AES security as it is for any other > algorithm (think about attacks on reduced-rounds AES/SHA/whatever). > > -- > Erwann ABALEA > > Le 13/03/2013 15:31, Ewen Chan a écrit : > >> So the algorithms include the number of rounds? I thought that it >> would only describe the math process and that it would be independent >> of the number of rounds (so long as you meed Rijndael's "minimum" - >> which is what the current number of rounds is set/default as). >> >> I did not know that. Hmmm....thanks. >> >> Does this mean that a AES-192-CBC is less secure than an AES-256-CBC >> because of the key length and the number of rounds associated with >> that; or am I understanding that wrong - that the number of rounds has >> less-so to do with the security of the algorithm compared to the key >> length? >> >> On Wed, Mar 13, 2013 at 10:24 AM, Erwann Abalea >> <erwann.aba...@keynectis.com> wrote: >>> >>> If you change the number of rounds, then it's not AES anymore, but a >>> custom >>> Rijndael. >>> Reading the source code, it appears there's no support for that in >>> OpenSSL >>> (and poking inside an AES_KEY to change the number of rounds probably >>> won't >>> work). >>> >>> -- >>> Erwann ABALEA >>> >>> Le 13/03/2013 14:32, Ewen Chan a écrit : >>> >>>> There's a file that I want to encrypt using AES-192-CBC but with 19 >>>> rounds rather than the default 12-rounds. >>>> >>>> Is there a way for me to specify the number of rounds that I would >>>> like to use with the AES-192-CBC? (and override the algorithm >>>> defaults)? >>>> >>>> Is that something that I can within the openssl command itself (to >>>> encrypt a file) or is the process much more involved than that? And >>>> requires programming/scripting? >>> >>> > ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager majord...@openssl.org
