| Abbreviation | Definition |
|---|---|
| TCBA | Thread Can Be Archived |
| TCSEC | Trusted Computer System Evaluation Criteria |
| TDAR | Temporary Desktop Administration Rights |
| TDES | Tactical Data Encryption System |
| TDG | Three Days Grace |
| TDS | Trojan Defense Suite |
| TE | Transmission Encryption |
| TEA | Tiny Encryption Algorithm |
| TEI | Text Encoding Initiative |
| TEK | Transmission Encryption Key |
| TEKD | Transmission Encryption Key Device |
| TFA | Two-Factor Authentication |
| TFST | Tivoli Firewall Security Toolbox |
| TGB | TheGreenBow Personal Firewall |
| TGW | Trusted GateWay |
| THC | Totally Homogonous Cryptography |
| TIA | Total Information Awareness |
| TKG | Terminal Key Generator |
| TKI | Temporal Key Integrity |
| TLC | Trust Level Control |