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TripleDES.IsWeakKey Method

Determines whether the specified key is weak.

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

public static bool IsWeakKey(
	byte[] rgbKey
)

Parameters

rgbKey
Type: System.Byte[]

The secret key to test for weakness.

Return Value

Type: System.Boolean
true if the key is weak; otherwise, false.

ExceptionCondition
CryptographicException

The size of the rgbKey parameter is not valid.

Weak keys are keys that result in ciphers that are easy to break. If text is encrypted with a weak key, encrypting the resulting cipher again with the same weak key returns the original text. In 128-bit mode, if the first 64 bits are the same as the last 64 bits, the key is weak. In 192-bit mode, if the first 64 bits are the same as the second 64 bits or if the second 64 bits are the same as the last 64 bits, the key is weak.

Attempting to set a weak key results in a CryptographicException. When GenerateKey is called to create a random key, a weak key will never be returned.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

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

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0

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