| Mode | Description | Notes |
| CBC | cipher block chaining | "feedback" needs initialization vector |
| CFB | cipher feedback | IV |
| CTR | ||
| CTS | Cipher Text Stealing | |
| ECB | electronic codebook | simplest |
| NCFB | cipher feedback, in nbit | |
| NOFB | output feedback, in nbit | |
| OFB | output feedback, in 8bit | |
| STREAM |