Re: [cryptography] Zooko's semiprivate keys

2013-02-19 Thread Tony Arcieri
Here's an implementation of semiprivate keys in SAGE (courtesy DCoder) that actually works: https://gist.github.com/tarcieri/40d2eb8e4e8f9ed28b3a I'm a bit lost as to where I'm going wrong in my NaCl-based implementation -- Tony Arcieri ___

Re: [cryptography] Which CA sells the most malware-signing certs?

2013-02-19 Thread ianG
On 19/02/13 02:33 AM, Jon Callas wrote: -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On Feb 18, 2013, at 7:07 AM, Peter Gutmann pgut...@cs.auckland.ac.nz wrote: I've just done a quick tally of the certs posted to http://www.ccssforum.org/malware-certificates.php, a.k.a. Digital Certificates

Re: [cryptography] Bitmessage

2013-02-19 Thread Michael Rogers
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi Jonathan, This looks like it could be a useful system, but I'm not sure I fully understand it. Each node is assumed to have a slowly changing set of addresses, is that right? A node migrates between streams by choosing whether to create new

Re: [cryptography] Bitmessage

2013-02-19 Thread Jonathan Warren
IMO you might want to do something about forward secrecy (aka backward security) and forward anonymity, or you arguably end up with the same issue as reply blocks: a subpoena plus suspicion can force decryption (you won’t have the decrypt the reply-block via repeated subpoenas down the chain,

Re: [cryptography] Bitmessage

2013-02-19 Thread James A. Donald
On 2013-02-20 6:21 AM, Jonathan Warren wrote: It is tricky indeed. The handshaking necessary to set up the session key could piggyback on the first couple messages that users send to one another although those first several messages would not be forward-secret. I suppose that the session key

Re: [cryptography] Bitmessage

2013-02-19 Thread Jonathan Warren
If store and forward, cannot be forward secrecy. Suppose that human readable messages, messages that might contain important secrets, are only exchanged when the sender and the final recipient are both online at the same time, then forward secrecy no problem. Both parties set up a shared