- ECB:
- Electronic Code Book mode
In the ECB mode, each block of plaintext is separately enciphered and each block of the ciphertext is separately deciphered. In other words, the encipherment or decipherment of a block is totally independent of other blocks.
https://www.ibm.com/docs/en/zos/2.1.0?topic=operation-electronic-code-book-ecb-mode