The Mode class defines the encryption mode types supported by TDGSS. The Mode attribute values shown in the Quality of Protection (QOP) must appear on this list.
| Mode Type | Description |
|---|---|
| NONE | Encryption not enabled |
| CBC | Cipher-block Chaining An operational mode for a block cipher, in which a set number of bits is encrypted as a single unit or block with a cipher key applied to the entire block. |
| CFB | Ciphertext Feedback An operational mode for block cipher, in which plaintext values are encrypted and transferred one at a time. |
| ECB | Electronic Code Book An operational mode for a block cipher in which each possible block of plaintext has a defined corresponding ciphertext value. For compatibility with legacy Teradata systems only. |
| OFB | Output Feedback An operational mode for a block cipher that permits encryption of differing block sizes, but the output of the encryption block function is the feedback instead of the cipher text. For compatibility with legacy Teradata systems only. |
| GCM | Galois/Counter Mode An operational mode for block cipher that uses universal hashing over a binary Galois field to provide authenticated encryption. |
| CCM | Counter with Cipher Block Chaining-MAC An operational mode for block cipher that combines counter mode encryption and CBC-MAC authentication. |
| CTR | Counter Mode An operational mode for block cipher that turns a block cipher into a stream cipher. It generates the next key stream block by encrypting successive values of a counter. |
This list of supported modes does not change unless you install a release of TDGSS that supports a different set of encryption modes.