DES.IsSemiWeakKey Method

Determines whether the specified key is semi-weak.

Namespace: System.Security.Cryptography
Assembly: mscorlib (in mscorlib.dll)

public static bool IsSemiWeakKey (
	byte[] rgbKey
)
public static boolean IsSemiWeakKey (
	byte[] rgbKey
)
public static function IsSemiWeakKey (
	rgbKey : byte[]
) : boolean

Parameters

rgbKey

The secret key to test for semi-weakness.

Return Value

true if the key is semi-weak; otherwise, false.

Exception typeCondition

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 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0

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