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diff --git a/pipermail/pycrypto/2012q2/000604.html b/pipermail/pycrypto/2012q2/000604.html new file mode 100644 index 0000000..72eec45 --- /dev/null +++ b/pipermail/pycrypto/2012q2/000604.html @@ -0,0 +1,103 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> +<HTML> + <HEAD> + <TITLE> [pycrypto] Typo or bug? + </TITLE> + <LINK REL="Index" HREF="index.html" > + <LINK REL="made" HREF="mailto:pycrypto%40lists.dlitz.net?Subject=Re%3A%20%5Bpycrypto%5D%20Typo%20or%20bug%3F&In-Reply-To=%3CCAEncD4cgP3kSXc-%3D%3Db%3DQeGxKhE%2BbFOyH2j0E-Hj0h8p8QeXUdw%40mail.gmail.com%3E"> + <META NAME="robots" CONTENT="index,nofollow"> + <style type="text/css"> + pre { + white-space: pre-wrap; /* css-2.1, curent FF, Opera, Safari */ + } + </style> + <META http-equiv="Content-Type" content="text/html; charset=us-ascii"> + <LINK REL="Previous" HREF="000603.html"> + <LINK REL="Next" HREF="000605.html"> + </HEAD> + <BODY BGCOLOR="#ffffff"> + <H1>[pycrypto] Typo or bug?</H1> + <B>Dave Pawson</B> + <A HREF="mailto:pycrypto%40lists.dlitz.net?Subject=Re%3A%20%5Bpycrypto%5D%20Typo%20or%20bug%3F&In-Reply-To=%3CCAEncD4cgP3kSXc-%3D%3Db%3DQeGxKhE%2BbFOyH2j0E-Hj0h8p8QeXUdw%40mail.gmail.com%3E" + TITLE="[pycrypto] Typo or bug?">dave.pawson at gmail.com + </A><BR> + <I>Tue Jun 26 07:59:29 EDT 2012</I> + <P><UL> + <LI>Previous message: <A HREF="000603.html">[pycrypto] Typo or bug? +</A></li> + <LI>Next message: <A HREF="000605.html">[pycrypto] Typo or bug? +</A></li> + <LI> <B>Messages sorted by:</B> + <a href="date.html#604">[ date ]</a> + <a href="thread.html#604">[ thread ]</a> + <a href="subject.html#604">[ subject ]</a> + <a href="author.html#604">[ author ]</a> + </LI> + </UL> + <HR> +<!--beginarticle--> +<PRE>On 26 June 2012 12:31, Legrandin <<A HREF="http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto">gooksankoo at hoiptorrow.mailexpire.com</A>> wrote: + +><i> Choice of the IV is critical for security. +</I>><i> For CFB, the combination IV and key must be use only with one message, and +</I>><i> never occur again. +</I>><i> That is explained here: +</I>><i> +</I>><i> <A HREF="https://www.dlitz.net/software/pycrypto/api/current/Crypto.Cipher.blockalgo-module.html#MODE_CFB">https://www.dlitz.net/software/pycrypto/api/current/Crypto.Cipher.blockalgo-module.html#MODE_CFB</A> +</I> +Thanks. +(I think I need more reading to select one!) + + +><i> +</I>><i> IV needs indeed to be share by the party encrypting and by the party +</I>><i> decrypting the message. +</I>><i> +</I>><i> Up to pycrypto 2.5, when no iv was provided to new() a string of zeroes was +</I>><i> automatically used. +</I>><i> Depending on your application, that may or may not be a problem. It is wiser +</I>><i> to always make iv explicit. +</I> + +Which explains why my 'old' code failed. Thanks. + +Needing both key and iv... It sounds like asking for two keys to unlock a box? +Is that the idea? + +regards + +-- +Dave Pawson +XSLT XSL-FO FAQ. +Docbook FAQ. +<A HREF="http://www.dpawson.co.uk">http://www.dpawson.co.uk</A> +</PRE> + + + + + + + + + +<!--endarticle--> + <HR> + <P><UL> + <!--threads--> + <LI>Previous message: <A HREF="000603.html">[pycrypto] Typo or bug? +</A></li> + <LI>Next message: <A HREF="000605.html">[pycrypto] Typo or bug? +</A></li> + <LI> <B>Messages sorted by:</B> + <a href="date.html#604">[ date ]</a> + <a href="thread.html#604">[ thread ]</a> + <a href="subject.html#604">[ subject ]</a> + <a href="author.html#604">[ author ]</a> + </LI> + </UL> + +<hr> +<a href="http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto">More information about the pycrypto +mailing list</a><br> +</body></html> |