23 block cipher modes of operation part 2 cns

Download 1M+ code from https://codegive.com/689e81e block cipher modes of operation are techniques that enhance the security of block ciphers. they allow for the encryption of data larger than the block size of the cipher and also provide various properties such as confidentiality and integrity. in this tutorial, we will continue discussing the block cipher modes of operation, focusing on several additional modes, including cipher block chaining (cbc), counter mode (ctr), and others. we will provide code examples in python using the `cryptography` library. block cipher modes of operation 1. cipher block chaining (cbc) **description**: in cbc mode, each block of plaintext is xored with the previous ciphertext block before being encrypted. this means that identical plaintext blocks will encrypt to different ciphertext blocks, providing better security. **initialization vector (iv)**: an iv is required for cbc mode. it should be unique and random for every encryption session. **code example**: 2. counter mode (ctr) **description**: ctr mode converts a block cipher into a stream cipher. it generates a unique counter value for each block, which is encrypted and then xored with the plaintext to produce the ciphertext. **initialization vector (iv)**: an iv is also required for ctr mode, but it is combined with a counter to ensure uniqueness. **code example**: 3. galois/counter mode (gcm) **description**: gcm mode combines the counter mode of encryption with galois mode of authentication. it provides both confidentiality and integrity. **code example**: summary in this tutorial, we covered three important modes of operation for block ciphers: 1. **cipher block chaining (cbc)**: provides confidentiality by chaining blocks together. 2. **counter mode (ctr)**: treats the block cipher as a stream cipher, allowing for parallel processing. 3. **galois/counter mode (gcm)**: offers both encryption and authentication, ensuring data integrity. these modes enhance the functionality of block ciphers and provide v ... #BlockCipher #CryptoSecurity #windows block cipher modes encryption techniques data security cryptographic algorithms symmetric encryption CBC mode ECB mode CFB mode OFB mode CTR mode GCM mode authentication modes data integrity secure communications cryptography principles