The Machine-to-Machine (M2M) Public Key Certificate Format
2015
The X.509 public key certificate format is overly verbose for
Internet-of-Things (IoT) constrained environments, where nodes with
limited memory and networks with limited bandwidth are not uncommon.
The Machine-to-Machine (M2M) certificate format is a pruned down and
encoding-optimized replacement for X.509, which reuses much of the
X.509 semantics but reduces certificate sizes by typically 40%. We are
proposing that IETF recognize the M2M format as an optional
replacement for X.509 in Internet applications including, but not
limited to, TLS and DTLS.
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