Apr 27, 2017 · OAEP only uses a two round Feistel network?! That's not even enough to be a random permutation (requires 3 rounds) let alone a strong random permutation (requires 4 rounds). $\endgroup$ – CodesInChaos

May 7, 2018 · I can't seem to wrap my head around what benefit OAEP provides (specifically with RSA). Lets consider really small numbers for a moment. If the random source in the padding algorithm gave a random value in the range of 1-100, then each unique message value could be represented by 100 different padded values.

Apr 7, 2018 · OAEP depends on a hash algorithm for the "correctness" property, and so as long as a good hash algorithm is used it means that there's no tricky secondary answers. Okay, so what about signatures? Similar (but different) arguments get us from textbook RSA to PKCS#1 signature padding.

To sum up, OAEP tries to improve over the previous padding for resistance against chosen ciphertext attacks (not chosen plaintext attack: since the public key is public, anybody can encrypt anything at will), but the v1.5 padding was already heuristically good at it, up to a million or so decryption, which is good enough for many purposes, and ...

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Aug 11, 2022 · Two implementations of RSA-OAEP encryption will always produce the same ciphertext if given the same inputs including the random number (which is normally not passed separately by the caller, but obtained directly by the implementation). And two implementations of RSA-OAEP decryption will always produce the same plaintext if given the same inputs.

Both the ECIES and RSA-OAEP submissions include the notion of a label (where it is called an encoding parameter), although absolutely no indication was given as to the role or function of a label. Nevertheless, it seems to be a potentially useful feature (..)

Aug 21, 2020 · OAEP is Optimal asymmetric encryption padding for RSA and developed by M. Bellare, P. Rogaway, in 1995 and standardized in PKCS#1 v2 and RFC 2437. Optimal Asymmetric Encryption -- How to encrypt with RSA. Extended abstract in Advances in Cryptology; Your image hiding some internals of the OAEP. Here a better one;

Nov 27, 2019 · I have ciphertext which was encrypted using RSA with "OAEPWithMD5AndMGF1Padding" - i.e. OAEP using MD5 for the Mask Generation Function. I understand the general idea of how the randomized padding works, but I'm not completely sure why the decryption process completely fails if I change one byte of the ciphertext.