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This expands CodesInChaos's comment into an answer. Forward Secrecy (that is, maintaining confidentiality of messages enciphered before compromise of the long term key) can be achieved in a protocol using a public-key signature scheme with a long-term public key, and a public-key encryption scheme with a per-session key; but in the case of RSA signature and ...


You're missing that key generation would occur inside the box (if there was one for RSA key agreement), like for $k_{pr,A}$ and $k_{pub,A}$ on page 343, rather than outside the box, as happened for $k_{pub,CA}$ on page 347.

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