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May
14
comment Is there a way to do fair exchange between two parties who don't trust each other?
@HenrickHellström The exchanged message would be a private key of cryptocurrency, so both parties are actually exchanging something of value, and aborting would be too late. Ill guess its just not possible without trusted mediator.
May
14
comment Is there a way to do fair exchange between two parties who don't trust each other?
I've read the references you gave, but it seems there has been done very little research in this area. I cannot find any well-known protocol or implementation.
Jul
13
comment Signatures: RSA compared to ECDSA
@DavidSchwartz To verify the signature I need the full public key, how would this function with only a secure hash in the mail-headers?
Jul
12
comment Signatures: RSA compared to ECDSA
@poncho Unfortunately not, because it's a decentral system (like email), so having a central authority where users would need to sign up to have their identifiers mapped to keys, will undermine the whole concept.
Jul
12
comment Signatures: RSA compared to ECDSA
"Does that mean that the verifier uses that public key to verify the message?" It is used to identify the senders, so you can add them to a white-list. If someone else signs the same (or a new) message, you can see that it wasn't from the same person you whitelisted.
Jul
12
comment Signatures: RSA compared to ECDSA
It seems that ECC requires less space, but this paper (nicj.net/files/…) states "Thus, for applications requiring message verification more often than signature generation, RSA may be the better choice." And verification performance is critical in my case, so I will have to research how big the difference is.
Jul
12
comment Signatures: RSA compared to ECDSA
@CodeInChaos That's shorter than RSA, but if the Public Key is larger, it doesn't save space ;)