🔐 File Encryption/Decryption System Based on 3DES, Blowfish, and MD5

✅ Usage Instructions

1. Select the file to be encrypted.

2. Choose the encryption mode:

   • Single encryption: Use either 3DES or Blowfish.
   • Double encryption: Use 3DES first, followed by Blowfish.

3. Execute the encryption process.

Additionally, a driver-based encryption method is available, which can be toggled via a dedicated switch in the UI.

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❗ Existing Issues

1. 3DES encryption is not compatible with Blowfish, causing problems in double encryption scenarios.
2. Appending the MD5 checksum at the end of the ciphertext is not a proper or secure method.
3. When using double encryption, the decryption order must be the reverse of the encryption order.

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🔧 Improvements to Be Made

1. Key storage method should be updated — for example, by storing keys in a MySQL database.

2. Double encryption could be integrated into a unified encryption scheme to simplify the process.

3. Optimize code performance:

   • Improve speed through multithreading.
   • Use data segmentation to enhance encryption/decryption efficiency.