What encryption device is certified to secure all classification levels and categories and is able to encrypt trunk-level high-speed circuits?

The TSEC/KIV-19 is a secure encryption device designed specifically for high-speed trunk communications and is certified to secure multiple classification levels and categories of information. Its capabilities include the encryption of high-speed trunk-level circuits, which are essential for transmitting sensitive data across networks securely.

Unlike the other devices mentioned, the KIV-19 supports higher data rates and is designed to function in various operational environments, making it particularly suitable for the needs of military and government communications. This encryption device utilizes advanced algorithms to ensure that all data transmitted remains secure, regardless of its classification. Thus, its ability to handle all classification levels effectively, coupled with high-speed circuit encryption, makes it the correct answer for this question.