On 02/05/2015 03:36 PM, MⒶrtin HⒶboⓋštiak wrote: >> A BIP-70 signed payment request in the initial broadcast can resolve the >> integrity issues, but because of the public nature of the broadcast >> coupled with strong public identity, the privacy compromise is much >> worse. Now transactions are cryptographically tainted. >> >> This is also the problem with BIP-70 over the web. TLS and other >> security precautions aside, an interloper on the communication, desktop, >> datacenter, etc., can capture payment requests and strongly correlate >> transactions to identities in an automated manner. The payment request >> must be kept private between the parties, and that's hard to do. > > What about using encryption with forward secrecy? Merchant would > generate signed request containing public ECDH part, buyer would send > back transaction encrypted with ECDH and his public ECDH part. If > receiving address/amount is meant to be private, use commit protocol > (see ZRTP/RedPhone) and short authentication phrase (which is hard to > spoof thanks to commit protocol - see RedPhone)?
Hi Martin, The problem is that you need to verify the ownership of the public key. A MITM can substitute the key. If you don't have verifiable identity associated with the public key (PKI/WoT), you need a shared secret (such as a secret phrase). But the problem is then establishing that secret over a public channel. You can bootstrap a private session over the untrusted network using a trusted public key (PKI/WoT). But the presumption is that you are already doing this over the web (using TLS). That process is subject to attack at the CA. WoT is not subject to a CA attack, because it's decentralized. But it's also not sufficiently deployed for some scenarios. e
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