Why Are My Initial Decrypted Bytes Incorrect in Java AES/CBC?

Initial Bytes Incorrect After Java AES/CBC Decryption

The initial bytes of the decrypted string in the provided Java AES/CBC decryption example appear incorrect. This can be caused by several reasons:

1. Missing Initial Vector (IV):

To perform decryption correctly, you must include the same IV used during encryption. In the given example, it seems that the IV is not being initialized before decryption, leading to incorrect decryption of the first bytes.

2. Incorrect Initialization Vector (IV):

The IV must match the IV used during encryption. If the IV is generated randomly, it should be the same random value that was used to encrypt the data.

3. Base64 Encoding/Decoding:

Ensure that the encrypted data is Base64 encoded before decryption. The given example does not include Base64 encoding, which may lead to incorrect decryption.

4. Character Set:

The default character set used for encoding/decoding is UTF-8. Confirm that the same character set was used during encryption and decryption.

5. Incorrect Key:

The encryption key must match the key used for decryption. Ensure that the correct key is used in both the encryption and decryption processes.

To resolve these issues and correctly decrypt the data, follow these steps:

• Initialize the IV using new IvParameterSpec(aesKey.getEncoded()) before decryption.
• Ensure that the encrypted data is Base64 encoded before decryption.
• Use the same character set (UTF-8) for both encryption and decryption.
• Confirm that the correct key is used for both encryption and decryption.

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