def remote_agreement_debug(self, fingerprint_debug, hash, delta):
"""THIS IS A DEBUG FUNCTION
using the fingerprint from the client
Using this means NO security!
8. Key Agreement on Server
generates fingerprint and decommits
using received ``hash`` and ``delta``
:param hash: SHA-512 Hash of codeword c
:type hash: str
:param delta: difference
:type delta: list
"""
log.info('8. Key Agreement on Server')
#===============================================================================
# Fingerprinting and Fuzzy Cryptography
#===============================================================================
# generate fingerprint, not used see possible fingerprints
self.fingerprint = fingerprint_energy_diff.get_fingerprint(self.recording_data, self.recording_samplerate)
# save fingerprint for debugging
scipy.savetxt("server_fingerprint.txt", self.fingerprint)
log.debug('Bob fingerprint:\n'+str(self.fingerprint))
# get possible fingerprints
possible_fingerprints = get_possible_fingerprints(self.recording_data, self.recording_samplerate)
# DEBUG
length = len(fingerprint_debug)
distances = []
for fingerprint in possible_fingerprints:
# calculate hamming distance between fingerprints
distance = hamming_distance(fingerprint, fingerprint_debug)
print('Distance: '+str(distance)+' of '+str(length))
print('Correlation percentage: '+str(1-float(distance)/float(length)))
distances += [distance]
min_distance = min(distances)
min_correlation = 1-float(min(distances))/float(length)
print('Minimal distance: '+str(min_distance)+' of '+str(length))
print('Minimal correlation percentage: '+str(min_correlation))
try:
minimals = scipy.genfromtxt(self.debug_file)
except Exception, err:
log.error('%s' % str(err))
print('first time, so creating minimals')
minimals = scipy.array([])
def remote_agreement(self, hash, delta):
"""8. Key Agreement on Server
generates fingerprint and decommits
using received ``hash`` and ``delta``
:param hash: SHA-512 Hash of codeword c
:type hash: str
:param delta: difference
:type delta: list
"""
log.info('8. Key Agreement on Server')
#===============================================================================
# Fingerprinting and Fuzzy Cryptography
#===============================================================================
# generate fingerprint, not used see possible fingerprints
self.fingerprint = fingerprint_energy_diff.get_fingerprint(self.recording_data, self.recording_samplerate)
# save fingerprint for debugging
scipy.savetxt("server_fingerprint.txt", self.fingerprint)
log.debug('Bob fingerprint:\n'+str(self.fingerprint))
# get possible fingerprints
possible_fingerprints = get_possible_fingerprints(self.recording_data, self.recording_samplerate)
for fingerprint in possible_fingerprints:
try:
# trying to decommit
self.private_key, corr = crypto_fuzzy_jw.JW_decommit(hash, delta, fingerprint, m=self.rs_code_m, n=self.rs_code_n, symsize=self.rs_code_symsize)
except Exception, err:
log.error('%s' % str(err))
else:
# if hash is the same accept key agreement,
# test is in JW_decommit, try fails when not!
# return True for accepted connection
return True
