cifrado de bloques(A cipher algorithm that encrypts data in discrete units (called blocks), rather than as a continuous stream of bits. The most common block size is 64 bits. For example, DES is a block cipher)
modo de cifrado(The method used to encrypt data. The stream cipher mode encodes data one bit at a time. The block cipher mode encodes data one block at a time. Although it tends to execute more slowly than stream cipher, block cipher is more secure)