Web Reference: Sep 17, 2025 · This walkthrough shows you how to use the TripleDES class to encrypt and decrypt strings using the Triple Data Encryption Standard (3DES) algorithm. The first step is to create a simple wrapper class that encapsulates the 3DES algorithm and stores the encrypted data as a base-64 encoded string. The basic idea is to make a cryptographic service provider and attach it to a stream. As you write into the stream, the provider automatically encrypts or decrypts the data. Your encryption looks mostly correct, but I am not sure if the UTF8 encoding or other settings on the encryption object is throwing you off. Here is the heart of the encryption method that we use, tailored slightly to your code:
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