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The Microsoft Enhanced RSA and AES Cryptographic Provider supports the same capabilities as the Microsoft Base Cryptographic Provider, called the Base Provider. The AES Provider supports stronger security through longer keys and additional algorithms. It can be used with all versions of CryptoAPI.
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Windows XP: The Microsoft AES Cryptographic Provider was named Microsoft Enhanced RSA and AES Cryptographic Provider (Prototype).
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The public key will be used in the encryption section and the private key used in the decryption. Encryption section - 1) Create a random AES key. 2) Encrypt this AES key with the RSA public key. Write the encrypted key it to the output. 3) Create a random IV for use with AES encryption. 4) Write it to the output. Public key is used for encryption and private key is used for decryption (e.g. Public key encryption is based on mathematical functions, computationally intensive. There are many examples of strong and weak keys of cryptography algorithms like DES, AES. RSA (Rivest–Shamir–Adleman) is one of the first public-key cryptosystems and is widely used for secure data transmission. In such a cryptosystem, the encryption key is public and distinct from the decryption key which is kept secret (private). Sep 30, 2019 To generate RSA keys using the RSAGenerateKeys function, call it in the following sequence of steps: Establish the pseudorandom number generator and prime number generator. Define the RSA private key type 2 in successive calls to the RSAGetSizePrivateKeyType2 and RSAInitPrivateKeyType2 functions with desired values of factorPBitSize and factorQBitSize parameters.
To maintain backward compatibility with earlier provider versions, the provider name, as defined in the Wincrypt.h header file, retains the version 1.0 designation even though newer versions of this provider have been shipped. To determine the version of the provider in use, call CryptGetProvParam with the dwParam parameter set to PP_VERSION. Version 2.0 is in use if 0x0200 is returned.
The following table highlights differences between the Base Provider, Strong Provider, and AES Provider. The key lengths shown are the default key lengths.
For a complete list of supported algorithms, see AES Provider Algorithms.
The Strong Provider, Enhanced Provider, and AES Provider are backward-compatible with the Base Provider except that the providers can generate only RC2 or RC4 keys of default key length. The default length for the Base Provider is 40 bits. The default length for the AES Provider is 128 bits. Thus the AES Provider cannot create keys with Base Provider-compatible key lengths. However, the AES Provider can import RC2 and RC4 keys of up to 128 bits. Therefore, the AES Provider can import and use 40-bit keys generated by using the Base Provider.
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