Replayable CCA security (RCCA security) is a security notion in

cryptography Cryptography, or cryptology (from grc, , translit=kryptós "hidden, secret"; and ''graphein'', "to write", or ''-logia'', "study", respectively), is the practice and study of techniques for secure communication in the presence of adver ...

that relaxes the older notion of Security against

Chosen-Ciphertext Attack A chosen-ciphertext attack (CCA) is an attack model for cryptanalysis where the cryptanalyst can gather information by obtaining the decryptions of chosen ciphertexts. From these pieces of information the adversary can attempt to recover the hidden ...

(CCA, more precisely ''adaptive'' security notion CCA2): all CCA-secure systems are RCCA secure but the converse is not true. The claim is that for a lot of use cases, CCA is too strong and RCCA suffices.Ran Canetti, Hugo Krawczyk, Jesper B. Nielsen, ''Relaxing Chosen-Ciphertext Security''. 2003 eprint archiv

/ref> Nowadays a certain amount of cryptographic scheme are proved RCCA-secure instead of CCA secure. It was introduced in 2003 in a research publication by

Ran Canetti Ran Canetti (Hebrew: רן קנטי) is a professor of Computer Science at Boston University. and the director of the Check Point Institute for Information Security and of the Center for Reliable Information System and Cyber Security. He is also ...

, Hugo Krawczyk and Jesper B. Nielsen.

References

Cryptography {{crypto-stub