read this about DES for example, and go figure about AES

Posted Mar 27, 2004 1:41 UTC (Sat) by hipparchus (guest, #20252)
In reply to: Re: AES is weak anyway by robbe
Parent article: Mainstream means more malicious code for Linux (SearchSecurity.com)

Please note AES is in itself a symmetric block cipher of say 128 or 256 bit size. HOWEVER the recommended imlementation for exchange of the cipher is public/private key encryption. (see my above mail about small number of solutions):

out of interest: DES cracker (they said it was uncrackable).

http://www.eff.org/Privacy/Crypto_misc/DESCracker/HTML/19980716_eff_des_faq.html#howsitwork

discussion on implementation of AES:

http://66.102.11.104/search?q=cache:OKqHzqpn-RcJ:www.parallaxresearch.com/dataclips/pub/infosec/cryptology/guidelines/STOA-Report3-5.pdf+nsa+chips+to+decode+aes&hl=en&ie=UTF-8