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Difference between Rijndael and RijndaelManaged

Difference between Rijndael and RijndaelManaged

Both Rijndael and RijndaelManaged are AES (Advanced Encryption Standard) ciphers, but there is a big difference between the two. Rijndael is an open source algorithm, while RijndaelManaged is Microsoft’s implementation of the Rijndael cipher. RijndaelManaged is more secure than Rijndael, due to its addition of key validation and other security features. However, Rijndael is still a very strong cipher and is often used in place of RijndaelManaged.

What is Rijndael?

Rijndael is a block cipher that was developed by two Belgian cryptographers, Vincent Rijmen and Joan Daemen. It was designed to replace the aging DES algorithm and was selected as the new standard by the U.S. government in 2001. Rijndael is a strong cipher that is resistant to known attacks. It can be used with a variety of key sizes and block sizes, making it very versatile. Rijndael is also fast and efficient, making it ideal for use in high-speed applications.

What is RijndaelManaged?

RijndaelManaged is a managed implementation of the Rijndael encryption algorithm. It is written in C# and is part of the .NET Framework. RijndaelManaged is used by the System.Security.Cryptography namespace to provide encryption services. RijndaelManaged supports all modes of operation defined in the Rijndael algorithm, including electronic codebook (ECB), cipher block chaining (CBC), cipher feedback (CFB), and output feedback (OFB). In addition, RijndaelManaged supports key sizes of 128, 192, and 256 bits, as well as block sizes of 64, 128, and 256 bits. RijndaelManaged is a FIPS-compliant cryptography provider.

Difference between Rijndael and RijndaelManaged

Rijndael and RijndaelManaged are both cryptographic algorithms used for data encryption. They are both based on the Rijndael cipher, which was developed by Belgian cryptographers Joan Daemen and Vincent Rijmen. The main difference between Rijndael and RijndaelManaged is that RijndaelManaged is a managed implementation of the Rijndael algorithm, meaning that it is written in managed code and can be used in .NET applications. Rijndael, on the other hand, is an unmanaged implementation of the algorithm written in C++. While both implementations are secure, RijndaelManaged is generally preferred as it is easier to use and more widely available.


In conclusion, the Rijndael algorithm is a more sophisticated and complex encryption method when compared to the RijndaelManaged implementation. The key difference between these two algorithms is that Rijndael uses a 256-bit key while RijndaelManaged uses a 128-bit key. Additionally, Rijndael does not use an initialization vector (IV) while RijnadaelManaged does. Finally, the number of rounds for each algorithm differs; 9 rounds for Rijndael and 12 rounds for RijndaelManaged.

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