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DES.IsWeakKey Method

Determines whether the specified key is weak.

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

static member IsWeakKey : 
        rgbKey:byte[] -> bool

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. There are four known weak keys for the Data Encryption Standard (DES) algorithm; this method checks for those weak keys.

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.

.NET Framework

Supported in: 4.6, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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