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CryptoAPI key permissions

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Hi, I'm doing some studies on CryptoAPI. When I create session keys (with or CryptoGenKey DeriveKey) I can set (function CryptSetKeyParam) and get (function CryptGetKeyParams) the parameters of the keys. What would be the specific use of the flag CRYPT_READ and CRYPT_WRITE in the function CryptSetParamKey? For example, if I set some parameters, can i make sure that they can't be changed later? I've already read the documentation on MSDN. Thanks in advance

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