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Analysis of the SPEKE password-authenticated key exchange protocol Muxiang Zhang Communications Letters, IEEE Volume 8, Issue 1, Jan. 2004 Page(s): 63 - 65 Digital Object Identifier 10.1109/LCOMM.2003.822506 Summary: In this letter, we show that for the SPEKE password-authenticated key exchange protocol, an adversary is able to test multiple possible passwords using a single impersonation attempt. In particular, when passwords are short Personal Identification Numbers (PINs), we show that a fully-constrained SPEKE is susceptible to password guessing attack. Our analysis contradicts the claim that the SPEKE protocol appears to be at least as strong as the Bellovin-Merritt EKE protocol. For EKE, an adversary can gain information about at most one possible password in each impersonation attempt. » View citation and abstract



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