TripleDES.IsWeakKey Method
Determines whether the specified key is weak.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- rgbKey
- Type: System.Byte[]
The secret key to test for weakness.
| Exception | Condition |
|---|---|
| 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 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.
