Encrypted Chat
Encrypt Fortress Umbra uses a combination of AES symmetric-key algorithm, the SHA-1 hash function, and the Diffie–Hellman key exchange with use of OTR (off the record) encryption. Encrypt Fortress Umbra secure messaging includes encryption, authentication amongst users, perfect forward and deniability secrecy.
Not only is the conversation encrypted, but the protocol is designed to provide deniability of the participants while protecting conversation confidentiality, like a private discussion in real life. This is a distinction when compared to other cryptography that produce records which can be later used as a verifiable history of the communication and the identities of the contributors.
Encrypt Fortress Umbra's use of fingerprints and authentication ensures you are speaking with the correct person now, and in the future. Once you start an encrypted conversation, you can then authenticate, i.e. confirm the identity of your contact, and they can be sure of yours as well. Once you exchange and confirm electronic fingerprints, you will not have to confirm again for that person on that device. On all future conversations, once the private chat (padlock) is enabled, the system will confirm with an easy to understand closed padlock and green check mark. This lets both parties know that the encryption is enabled.
Encrypt Fortress Umbra for voice and video uses a cryptographic key-agreement protocol to negotiate the keys for encryption between two end points, enhancing security and privacy while using audio or video. From a user's point of view, ZRTP is very easy to use and it does not require any training once it is applied.
From a security point of view it allows secure communication following supported symmetric cryptographic algorithms: AES Counter Mode with 128 bit key length, AES Counter Mode with 256 bit key length, Twofish Counter Mode with 128 bit key length, and Twofish Counter Mode with 256 bit key length.
Encrypt Fortress Umbra deploys preventive measures to alert the clients to identify MitM (Man in the Middle attacks), and to ensure no one interfered with the ZRTP encryption negotiation. Encrypt Fortress Umbra utilizes simple to use, yet powerful mechanics which are (SAS) Short Authentication String and (RS) Retained Shared Secrets.
When a call is made both the caller and recipient will see a SAS (4 character key displayed on screen), and each caller can confirm the SAS data and match it verbally over the secure connection. A secure way to confirm the SAS is for one caller to read the first two SAS characters, then the other party reads the last two characters. If the SAS matches then no one interfered with the key negotiation of ZRTP encryption. Matching up the SAS is best done at the start of the call and while in typical conversation.
After confirming the SAS info each person can change the SAS status to verified. Once both parties verify, Encrypt Fortress Umbra will use the secure info in further encrypted connections. If the SAS key does not match or if Encrypt Fortress Umbra detects a possible MitM, Encrypt Fortress Umbra generates a warning message.
IT Operations Manager, LTD Card
Communications, Marketing Clear
Encrypt Fortress Umbra is packed with amazing features. You get one-on-one and group video calling, text and picture messaging, screen sharing, free voice calling, and more while all staying completely encrypted with almost no extra effort.
We needed to rethink our digital communications strategy and switch to a secure messaging program. Members of our company were all using different platforms such as Skype, SnapChat, Facebook Chat, WhatsApp, or Google Chat. As part of a campaign to find "Secure and usable crypto," we evaluated 29 messaging products ranging from chat clients, text messaging apps, email applications, and voice and video call tools to find what would work for all our employees to unify them. In the end, it was the features and Ease of use to stay secure in Encrypt Fortress Umbra and messaging that made us switch.
Attorney, Global Legal & Business Services
COO, WhyOffShore.com