st lines, through the
implementation of dummy ciphers and MAC with TLS_NULL_WITH_NULL_NULL.)

These attributes and behaviours are mostly mapped in this class.
Also, note that Scapy may make a current state out of a pending state
which has been initialized with dummy security parameters. We need
this in order to know when the content of a TLS message is encrypted,
whether we possess the right keys to decipher/verify it or not.
For instance, when Scapy parses a CKE without knowledge of any secret,
and then a CCS, it needs to know that the following Finished
is encrypted and signed according to a new cipher suite, even though
it cannot decipher the message nor verify its integrity.
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