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Asked: 2026-05-27T10:30:28+00:00

I am using C# 4.0 Windows Application.I want to give encryption key to protect

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I am using C# 4.0 Windows Application.I want to give encryption key to protect my file using System.Text.ASCIIEncoding.So, Here my encryption key is SARAVANAN and key length of this is 9. 

 String enKey="SARAVANAN";
 DESCryptoServiceProvider des = new DESCryptoServiceProvider();
 des.Key = ASCIIEncoding.ASCII.GetBytes(enKey);

it raised the exception like “Specified key is not a valid size for this algorithm”.But it is working good at length of 8 only.So,i would like to know is there any restriction to this length due to this ASCII ENCODING…

Please guide me get out of this issue?

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1 Answer

  1. Editorial Team

    64 bits is the only valid key size for the DES encryption algorithm.

    ASCII encoding uses 8 bits per character, therefore 8 ASCII characters == 64 bits.

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