Re: [TLS] one time passwords from private keys
Ben Laurie <benl@google.com> Sun, 28 February 2010 15:09 UTC
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Date: Sun, 28 Feb 2010 15:09:17 +0000
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From: Ben Laurie <benl@google.com>
To: Story Henry <henry.story@bblfish.net>
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Subject: Re: [TLS] one time passwords from private keys
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On 28 February 2010 14:58, Story Henry <henry.story@bblfish.net> wrote: > Hello, > > I am looking around to see if anyone knows an algorithm to allow one to > produce a one time password [1] from the private key part of an asymmetric > key pair. > > The article "Public-Key Cryptography and Password Protocols" > http://www.cparity.com/projects/AcmClassification/samples/322514.pdf > shows how to do the inverse. > > The idea is to make it possible to authenticate into any web site using > this one time password. The public key would be tied to a WebId/OpenId, > following something like the following steps: > > 1. A server should be able to know for any webId/openid the public key of > that id > > 2. the user will have > - the private key > - using its private key (and perhaps a time stamp, or a nonce from the > server, ... ) the user's software would calculate a one time password which > the user could then send with its WebId/OpenId to the server > > 3. the server which gets the openid/webid find the public key securely and > use > that to verify the one time password (somehow) > > This would allow us to make it easy to create RESTful authentication for > devices with broken (Safari on desktop and iphone) or non existent client > side certificates (Android, and most other phones). > > For devices with working client side certificates we have foaf+ssl that > works reasonably well currently - though we would love the browser vendors > to implement user interface improvements. http://esw.w3.org/topic/foaf+ssl > > > What we are looking may be impossible. But we can't tell before looking > :-) > Also if you know of lists that are open source/open standard spirited that > you think I should send this question to, please let me know. > One way of doing what you want is a Schnorr signature. One nice property of a Schnorr signature is that the private key can easily be derived from a password, or could just be a random blob. I'm doing some work in this area, so feel free to contact me offlist if you're interested. > > Henry > > [1] http://en.wikipedia.org/wiki/One_time_password > http://code.google.com/p/mod-authn-otp/wiki/OneTimePasswords > > Social Web Architect > http://bblfish.net/ > > _______________________________________________ > TLS mailing list > TLS@ietf.org > https://www.ietf.org/mailman/listinfo/tls >
- [TLS] one time passwords from private keys Story Henry
- Re: [TLS] one time passwords from private keys Ben Laurie
- Re: [TLS] one time passwords from private keys Ben Laurie
- Re: [TLS] one time passwords from private keys Story Henry
- Re: [TLS] one time passwords from private keys Adam Langley
- Re: [TLS] one time passwords from private keys Ben Laurie
- Re: [TLS] one time passwords from private keys Story Henry
- [TLS] one time passwords from private keys Story Henry
- Re: [TLS] one time passwords from private keys Henrik Nordström