1

after getting an answer to Security over multi-streaming such as SCTP i have found that i do not have the capacity to give a public key or certificate to the other end securely (to be sure MitM cannot substitute one and that no-one can see it). i do have the capacity to send a 256-bit key securely. both ends are under the same admin but there is no opportunity to set up a key or cert on either end besides the mentioned limited capacity (because it is a cloud image launched when needed). "shared secret" seems to be the wrong terminology as all uses i see for this refer to sharing between different parties (the "sharing" is just between these two ends). this is also a symmetric connection once established ... such as a VPN (it will be used as a VPN and it will use SCTP). my question is: how can i be sure this is secure? security is hard.

i have used openssl before in this script and am looking to use its C-layer API for this project.

2

There is a variation of TLS that uses a Pre-Shared Key instead of certificates, called TLS-PSK. This basically works the same way as usual TLS except the session key is generated in a different way. You should take a look at this.

  • ok ... i will start here: en.wikipedia.org/wiki/TLS-PSK – Skaperen Jun 9 '15 at 12:17
  • You may want to have a look at RFC 4279 too – ero Jun 9 '15 at 12:19
  • that RFC is linked in the wiki article. i will look there next and then the openssl docs. – Skaperen Jun 9 '15 at 12:23

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.