Hi all, Here is a good link about block cipher algorithm that explains this. It also explain the "mode": ECB, EFB, OFB, CBC (in SSL/TLS CBC one is used)
http://www.cacr.math.uwaterloo.ca/hac/ Chapter 7 - Block Ciphers regards, Fred -----Original Message----- From: Michael Sierchio [mailto:[EMAIL PROTECTED] Sent: Wed 5/10/2006 6:10 PM To: openssl-users@openssl.org Cc: Subject: Re: Regarding the IV in symertric encryption. Girish Venkatachalam wrote: > The IV is used only for decrypting the first block > since after that the first block serves as the IV for > the second block and so on. > > To answer ur question, the IV has to be known at both > sides along with the key. There is no sound cryptological argument for not conveying the IV as the first block of ciphertext. It should be a random nonce, and should never be repeated. This argues against using a shared value known in advance. ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager [EMAIL PROTECTED] ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager [EMAIL PROTECTED]
