Fix typo in  certificate_chain.py
@@ -140,7 +140,7 @@ class CertificateChain(object):
if core.expiration_time > trc.exp_time:
raise SCIONVerificationError(
"Core AS certificate verification failed: Core certificate expires after TRC. "
- "Core: %s TRC: %s" % (iso_timestamp(trc.expiration_time),
+ "Core: %s TRC: %s" % (iso_timestamp(core.expiration_time),
iso_timestamp(trc.exp_time)))
try:
core.verify(leaf.issuer, trc.core_ases[core.issuer][ONLINE_KEY_STRING])
