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Asked: 2026-05-26T14:50:10+00:00

Up to now, I thought that if I have RSA-encrypted data, this data would

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Up to now, I thought that if I have RSA-encrypted data, this data would be easily exchangable between most platforms (.net, java, pc, unix..), because of the commonly used algorithm.

Through investigating for another questions I had, I’m now confused. I have found even between MS-implementations differences (some provider reverse the resulting byte-array). Moreover the padding seems not to follow a standardization.

Can someone with experience in cross platform cryptography give a statement, if RSA-encoded data is relatively simple exchangable (with some obvious pitfalls) or if this is a headache?

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1 Answer

  1. Editorial Team

    Note that RSA encryption is normally not used by itself, but in combination with a symmetric encryption algorithm.
    So, to make sure to be interoperable, you need to make sure that:

    • Both sides use the same padding scheme for RSA (e.g. the one originally defined in PKCS#1 v1.5, or OAEP). (That does not mean that the padding has to be deterministic, just that the decrypter know which bits of the decrypted text was padding and which were the original message).
    • Both sides use the same format for their messages (e.g. the one in PKCS#7 or its successors).
    • Both sides use the same symmetric algorithm (e.g. AES-128), mode of operation (e.g. CBC) and block cipher padding scheme (e.g. PKCS#5-padding).
    • The encrypting party must use the public key corresponding to the private key used by the decrypting party.
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