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While OAEP uses a one-way function on the plaintext, it's not quite a hash: it's called a mask generation function (MGF), and unlike a hash it can produce as much or as little output as you want (the output length is an argument to the function, and input length is decoupled from output length). This output should be pseudorandom. You use this in a ...


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There exist many standards which describe a lot of padding modes and security protocols. If you're new in that field, I strongly recommend you to study the family of PKCS standards which are the reference in the domain. There also exist other distinct standards depending of very specific application fields (Banking, mobile, Cloud, Embedding ... or Global ...



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