Curious question - still more about AES and CBC and openssl: Does the number of rounds during the encryption phase of it have to match the number of rounds during the decryption phase of it, or does it not matter? (i.e. the "rounds" count really only matters during the encryption-only phase, and for decryption; it is independent of it)?
On Sat, Mar 16, 2013 at 11:33 PM, Ewen Chan <chan.e...@gmail.com> wrote: > I was just curious, cuz other people have spelled it that way as well. > And I just wanted to be sure. Thanks. > > On Sat, Mar 16, 2013 at 11:29 PM, <shath...@e-z.net> wrote: >> Congrats! you caught my typing error. >> Steven J. Hathaway >> >>> Thanks. >>> >>> Is the name spelt Rijndael or Rijndahl? >>> >>> On Sat, Mar 16, 2013 at 8:15 PM, <shath...@e-z.net> wrote: >>>> AES/Rijndahl >>>> >>>> AES has fixed number of rounds and other parameters. >>>> Rijndahl allows you to specify the algorithm parameters including number >>>> of rounds. >>>> >>>> Steven J. Hathaway >>>> >>>>> So is the number of rounds set by Rijndahl or the AES spec? I'm >>>>> confused. >>>>> >>>>> And is the number of rounds hard-coded into the OpenSSL source; or is >>>>> it embedded somewhere else? >>>>> >>>>> On Fri, Mar 15, 2013 at 7:27 PM, <shath...@e-z.net> wrote: >>>>>> I don't know the interfaces to OpenSSL, but AES-192 specifies the >>>>>> number >>>>>> of rounds. The approved AES algorithms specify a subset of Rijndahl >>>>>> cipher whereby you can specify alternative numbers of rounds, key >>>>>> sizes, and block sizes. >>>>>> >>>>>> Sincerely, >>>>>> Steven J. Hathaway >>>>>> >>>>>>> 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 >>>>>>> >>>>>>> >>>>>> >>>>>> >>>>>> ______________________________________________________________________ >>>>>> OpenSSL Project http://www.openssl.org >>>>>> User Support Mailing List openssl-users@openssl.org >>>>>> Automated List Manager majord...@openssl.org >>>>> ______________________________________________________________________ >>>>> OpenSSL Project http://www.openssl.org >>>>> User Support Mailing List openssl-users@openssl.org >>>>> Automated List Manager majord...@openssl.org >>>>> >>>>> >>>> >>>> >>>> ______________________________________________________________________ >>>> OpenSSL Project http://www.openssl.org >>>> User Support Mailing List openssl-users@openssl.org >>>> Automated List Manager majord...@openssl.org >>> ______________________________________________________________________ >>> OpenSSL Project http://www.openssl.org >>> User Support Mailing List openssl-users@openssl.org >>> Automated List Manager majord...@openssl.org >>> >>> >> >> >> ______________________________________________________________________ >> OpenSSL Project http://www.openssl.org >> User Support Mailing List openssl-users@openssl.org >> Automated List Manager majord...@openssl.org ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager majord...@openssl.org
