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<H1>[pycrypto] Remove DSA because 1024bit is not safe</H1>
<B>Dwayne Litzenberger</B>
<A HREF="mailto:pycrypto%40lists.dlitz.net?Subject=Re%3A%20%5Bpycrypto%5D%20Remove%20DSA%20because%201024bit%20is%20not%20safe&In-Reply-To=%3C5106B53E.7030308%40dlitz.net%3E"
TITLE="[pycrypto] Remove DSA because 1024bit is not safe">dlitz at dlitz.net
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<I>Mon Jan 28 09:28:30 PST 2013</I>
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<PRE>That said, we should probably support the newer spec:
>>> from Crypto.PublicKey import DSA
>>> DSA.generate(3072)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python2.7/dist-packages/Crypto/PublicKey/DSA.py",
line 337, in generate
raise ValueError("Number of bits in p must be a multiple of 64
between 512 and 1024, not %d bits" % (bits,))
ValueError: Number of bits in p must be a multiple of 64 between 512
and 1024, not 3072 bits
On 01/28/2013 02:21 AM, Legrandin wrote:
><i> I think you are looking at an older FIPS 186 spec.
</I>><i> The current one allows 3072 bits for DSA.
</I>><i>
</I>><i> Besides that, DSA is based on a different hard problem than RSA.
</I>><i> A 1024 bit DSA signature is somewhat more secure than a 1024 bit RSA
</I>><i> signature.
</I>><i>
</I>><i> 2012/12/12 . <<A HREF="http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto">dcMhOYBdpZkH at web.de</A> <mailto:<A HREF="http://lists.dlitz.net/cgi-bin/mailman/listinfo/pycrypto">dcMhOYBdpZkH at web.de</A>>>
</I>><i>
</I>><i> It is important to consider 1024bit DSA - NIST says this too - not
</I>><i> secure anymore, or do you want your messages to be readable within
</I>><i> your lifetime?.
</I>><i> Since DSA max. key size is 1024bit it's time to think
</I>><i> about removing it completely from pycrypto and use RSA or ECC
</I>><i> (with your
</I>><i> own curves, not NIST's untrustable ones).
</I>><i>
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