TripleDES.IsWeakKey(Byte[]) Method

Reference

Definition

Namespace:: System.Security.Cryptography

Assemblies:: netstandard.dll, System.Security.Cryptography.dll

Assemblies:: netstandard.dll, System.Security.Cryptography.Algorithms.dll

Assembly:: System.Security.Cryptography.Algorithms.dll

Assembly:: mscorlib.dll

Assembly:: netstandard.dll

Source:: TripleDES.cs

Source:: TripleDES.cs

Source:: TripleDES.cs

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Determines whether the specified key is weak.

public:
 static bool IsWeakKey(cli::array <System::Byte> ^ rgbKey);

public static bool IsWeakKey(byte[] rgbKey);

static member IsWeakKey : byte[] -> bool

Public Shared Function IsWeakKey (rgbKey As Byte()) As Boolean

Parameters

rgbKey: Byte[]

The secret key to test for weakness.

Returns

Boolean

true if the key is weak; otherwise, false.

Exceptions

CryptographicException

The size of the rgbKey parameter is not valid.

Remarks

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.

Applies to

Product	Versions
.NET	Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10
.NET Framework	1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard	1.3, 1.4, 1.6, 2.0, 2.1

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