It would be a mistake to encrypt 20 strings using an instance of the Crypt2 object, and then attempt to decrypt with the same Crypt2 object. The 1st decrypt should begin with a new instance of a Crypt2 object so that it's counter is at the initial value of 0. The decrypting application would need to decrypt in exactly the same manner. This is because the counter is being incremented. For example, if an application encrypted the string "1234567890" twenty times in a row, using the same instance of the Chilkat Crypt2 object, then each iteration's result would be different. (2) CTR mode increments a counter for each subsequent block encrypted. The PaddingScheme property does not apply for counter mode. With CTR mode, the number of bytes output is exactly equal to the number of bytes input, so no padding/unpadding is required. Normally, a block encryption algorithm (AES, Blowfish, DES, RC2, etc.) emit encrypted output that is a multiple of the block size (16 bytes for AES as an example). Demonstrates how to encrypt using AES CTR mode.
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June 2023
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