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Adding to David Cash's answer, besides SAEP and SAEP+ by Boneh, there is another paper that improves OAEP using only a one-round Feistel structure and has an additional feature: redundancy-free encryption (which none of OAEP, SAEP and SAEP+ have). Read Verified Security of Redundancy-Free Encryption from Rabin and RSA by Barthe, Poitcheval and Beguelin (2012).

Adding to David Cash's answer, besides SAEP and SAEP+ by Boneh, there is another paper that improves OAEP using only a one-round Feistel structure and has an additional feature: redundancy-free encryption (which none of OAEP, SAEP and SAEP+ have). Read Verified Security of Redundancy-Free Encryption from Rabin and RSA by Barthe, Poitcheval and Beguelin (2012).

Adding to David Cash's answer, besides SAEP and SAEP+ by Boneh, there is another paper that improved OAEP using only one-round Feistal structure and with an additional feature: redundancy-free encryption (which none of OAEP, SAEP and SAEP+ have). Read Verified Security of Redundancy-Free Encryption from Rabin and RSA by Barthe, Poitcheval and Beguelin (2012).

Adding to David Cash's answer, besides SAEP and SAEP+ by Boneh, there is another paper that improves OAEP using only a one-round Feistel structure and has an additional feature: redundancy-free encryption (which none of OAEP, SAEP and SAEP+ have). Read Verified Security of Redundancy-Free Encryption from Rabin and RSA by Barthe, Poitcheval and Beguelin (2012).

Addendum:

Recently, besides SAEP and SAEP+ by BOneh [1], there is another paper improved the OAEP using only one round feistal's structure and with additional feature: redundancy-free encryption as oppose to OAEP, SAEP and SAEP+.

U can refer to Barthe, Poitcheval Beguelin (2012) verified security of redundancy-free encryption from rabin and rsa.

Adding to David Cash's answer, besides SAEP and SAEP+ by Boneh, there is another paper that improved OAEP using only one-round Feistal structure and with an additional feature: redundancy-free encryption (which none of OAEP, SAEP and SAEP+ have). Read Verified Security of Redundancy-Free Encryption from Rabin and RSA by Barthe, Poitcheval and Beguelin (2012).