-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 "James A. Donald" <[email protected]> writes:
> On 2012-09-05 11:51 PM, StealthMonger wrote: >> Can there be a cryptographic "dead man switch"? A secret is to be >> revealed only if/when signed messages stop appearing. It is to be >> cryptographically strong and not rely on a trusted other party. > Such a system cannot exist: > Obviously the messages have to appear on the system that contains the > secret. Pull the internet connection. Counter-measures to Donald's dilemma have so far involved servers too hidden or numerous to simply "pull the internet connection". Another approach is for the server to be "too big to fail", i.e. public and widely used, so that a whole business would be destroyed if the Internet connection were pulled. It wouldn't take much capability in such a server to allow Grantor to create a robot there which gives Trustee access to the secret, but only if it doesn't hear from the Grantor for some time. With suitable permissions, the Trustee can even be given read-only access the whole while to everything except to the secret itself, so that Trustee can assure herself that it's all actually there. Are there existing public servers that can provide this functionality? Google mail? Zooko's Tahoe? - -- -- StealthMonger <[email protected]> Long, random latency is part of the price of Internet anonymity. anonget: Is this anonymous browsing, or what? http://groups.google.ws/group/alt.privacy.anon-server/msg/073f34abb668df33?dmode=source&output=gplain stealthmail: Hide whether you're doing email, or when, or with whom. mailto:[email protected]?subject=send%20index.html Key: mailto:[email protected]?subject=send%20stealthmonger-key -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Processed by Mailcrypt 3.5.9 <http://mailcrypt.sourceforge.net/> iEYEARECAAYFAlBd+C8ACgkQDkU5rhlDCl4gmQCeNRJga4jKwFecbsYWi1LgUSv6 eYsAniTaSeZ8raCBfENb9H+hgdfZ+bxB =rty8 -----END PGP SIGNATURE----- _______________________________________________ cryptography mailing list [email protected] http://lists.randombit.net/mailman/listinfo/cryptography
