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Your problem is not with the signature scheme, something else is wrong. RSA is specified by the RSA cryptography standard, PKCS#1 (mirrored in various RFC's). The PKCS#1 v1.5 padding was introduced in version 1.5 but it persisted in 2.0, 2.1 and 2.2. Those did however introduce a more secure padding scheme called PSS. Unfortunately nobody calls the ...


For a CBC mode cipher, which is what POODLE applies to, you don't encrypt or decrypt individual bytes, but rather blocks, formed by adding padding to the actual data bytes. For encryption in general every byte can be any value 0 to 255, and the SSL spec allows the padding_length byte to be almost any value, but most if not all implementations only use 0 to ...

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