Abstract
In this paper, we introduce and study a new cryptographic primitive that we call puncturable key encapsulation mechanism (PKEM), which is a special class of KEMs that satisfy some functional and security requirements that, combined together, imply chosen ciphertext security (CCA security). The purpose of introducing this primitive is to capture certain common patterns in the security proofs of the several existing CCA secure public key encryption (PKE) schemes and KEMs based on general cryptographic primitives which (explicitly or implicitly) use the ideas and techniques of the Dolev-Dwork-Naor (DDN) construction (STOC’91), and ‘‘break down” the proofs into smaller steps, so that each small step is easier to work with/verify/understand than directly tackling CCA security.
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