aes gcm java example

aes (advanced encryption standard) in galois/counter mode (gcm) is a widely used encryption algorithm that provides both confidentiality and integrity. gcm is an authenticated encryption mode that combines the speed of counter mode with the authenticity provided by galois mode.

overview of aes-gcm
- **aes:** a symmetric key encryption algorithm that encrypts data blocks of 128 bits, using key sizes of 128, 192, or 256 bits.
- **gcm:** a mode of operation for symmetric key cryptographic block ciphers that not only encrypts the data but also provides authentication for both the ciphertext and optional additional authenticated data (aad).

key features of aes-gcm
- provides both encryption and authentication.
- works with arbitrary-length messages and additional data.
- suitable for high-speed applications.

setting up your java environment
make sure you have java development kit (jdk) installed. you can use any ide like intellij idea, eclipse, or just a simple text editor.

maven dependency

code example
here's a simple java program demonstrating aes-gcm encryption and decryption:

explanation of the code
1. **key generation:** a symmetric key is generated using `keygenerator`. you can specify the key size (128, 192, or 256 bits).
2. **initialization vector (iv):** a random iv is generated for each encryption operation. this iv ensures that the same plaintext encrypts to different ciphertexts each time.
3. **encryption:** the `encrypt` method initializes the cipher in encryption mode and applies it to the plaintext.
4. **decryption:** the `decrypt` method initializes the cipher in decryption mode and applies it to the ciphertext to retrieve the original plaintext.
5. **output:** the program prints the original plaintext, the ciphertext (in base64), and the decrypted text.

important notes
- **security considerations:** always use a unique iv for eac ...

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