DES.IsSemiWeakKey Method
Determines whether the specified key is semi-weak.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- rgbKey
- Type: System.Byte[]
The secret key to test for semi-weakness.
| Exception | Condition |
|---|---|
| CryptographicException | The size of the rgbKey parameter is not valid. |
Semi-weak keys are pairs of keys that result in ciphers that are easy to break. If text is encrypted with a semi-weak key, encrypting the resulting cipher with the partner of that semi-weak key returns the original text. There are six known semi-weak key pairs for the Data Encryption Standard (DES) algorithm; this method checks for those semi-weak keys.
Attempting to set a semi-weak key results in a CryptographicException. When GenerateKey is called to create a random key, a semi-weak key will never be returned.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
