Optimal Asymmetric Encryption Padding is a padding scheme for RSA, codifying how short plaintext is enciphered and deciphered. It has a security reduction to the RSA problem.

Optimal Asymmetric Encryption Padding is standardized under the name RSAES-OAEP in PKCS#1 v2.2 and RFC 2437.

The reference paper is: M. Bellare and P. Rogaway, Optimal asymmetric encryption (subtitled How to encrypt with RSA on the first author's webpage), in proceedings of EuroCrypt 1994.

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