*Advanced Encryption Standard-128 CTR (Counter) is a mode of operation for the AES algorithm.
*AES is a widely used symmetric encryption algorithm known for its security and efficiency.
*AES-128 CTR mode involves expanding the key into round keys and initializing a counter value.
*For each data block, the counter is encrypted to generate a keystream.
*The keystream is XORed with the plaintext or ciphertext block to produce the encrypted or decrypted block.
*The counter value is incremented for the next block, and the process is repeated until the entire message is processed.
*CTR mode allows for parallel encryption and decryption of blocks, making it efficient for small and large data sets.
*It also provides random access to the ciphertext without requiring preceding blocks.
*The security of AES-128 CTR relies on the uniqueness of the counter values.
*Reusing the same counter value with the same key compromises the encryption's security.
*It is crucial to use a unique nonce and/or block number for each encryption operation.
In conclusion, AES-128 CTR is a secure and efficient mode of operation for AES encryption, providing confidentiality for data transmission or storage.