# SteelBox > Secure, end-to-end encrypted communication service for government and national security. (iPhone/iPad app by CACI, INC. - FEDERAL.) - Source: https://appshunter.io/ios/app/steelbox/id1501553613 (this page in markdown: same URL + `.md`) - Developer: [CACI, INC. - FEDERAL](https://appshunter.io/developer/1501553612) - Category: Productivity - Price: Free - Rating: 5.00/5 from 7 App Store ratings - Age rating: 4+ - Requires: iOS 13.0 · 112 MB - Languages: American English, Arabic, Canadian French, German (Germany), Italian, Korean, Norwegian Bokmål, Polish, European Portuguese, Russian and 4 more - Released: 2020-04-03 - Data updated: 2026-06-10 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/steelbox/id1501553613/reviews.md ## What is SteelBox? CACI SteelBox, mobile end-to-end secure communication service offered to the government customers. ***** YOU MUST ACQUIRE A VALID LICENSE DIRECTLY FROM CACI International Inc. TO USE SteelBox® ***** SteelBox® is a secure communication solution for end-to-end encryption of voice calls and instant messages to protect you from the threat of eavesdropping. The SteelBox® app for iOS connects calls quickly, keeps them secure and ensures excellent voice quality. SteelBox® is an independently validated and certified encrypted mobile communications tool for the communications of official Secret/Classified/Restricted/Confidential data over voice and IM. SteelBox® is adopted by many leading world governments for the protection of National Security through secure mobile communications. Key features include: • Send messages to individuals and groups that can include shared content such as documents, images, and videos • Secure group voice calls with an existing group, or create a new group with those you need to speak with now • Voice and message communication secured with strong data-in-transit (DIT) and data-at-rest (DAR) encryption • Instantaneous call setup with ultra-fast key agreement and superb voice quality • Connection to customer PBX, conferencing server and PSTN, allowing for extended functionalities such as breakout calling, break-in calling, and conferencing • Supports dual layers of encryption across data channels, complies with Commercial National Security Algorithm Suite cryptography requirements, and FIPS 140-2 (NIST) • Common Criteria certified and NIAP Protection Profile compliant with NATO approval in progress • On-premise installation of the backend provides full system sovereignty and control for the customer to meet compliance requirements • Hosted solution available providing deployment flexibility but retaining all of the security features highlighted above • MDM/EMM-agnostic; however, recommend pairing with BlackBerry UEM • Remote deployment and simple user management through a user-friendly, centralized admin portal ## Key features - End-to-end encrypted voice calls - Secure instant messaging with file sharing - Group voice calls - Dual-layer encryption - PBX and PSTN integration - On-premise or hosted deployment ## Frequently asked questions about SteelBox ### What is SteelBox? SteelBox is a secure communication solution offering end-to-end encryption for voice calls and instant messages. It is designed for government customers to protect sensitive data from eavesdropping and ensure high-quality communication. ### How do I use SteelBox? To use SteelBox, you must acquire a valid license directly from CACI International Inc. The app then provides secure voice and message communication features. ### What kind of data can be secured with SteelBox? SteelBox is certified for the communication of official Secret/Classified/Restricted/Confidential data. It supports voice and instant messaging, including shared content like documents, images, and videos. ### Does SteelBox support group communication? Yes, SteelBox supports secure group voice calls. You can join an existing group or create a new one for immediate communication needs. ### What encryption standards does SteelBox comply with? SteelBox supports dual layers of encryption and complies with Commercial National Security Algorithm Suite cryptography requirements and FIPS 140-2 (NIST). It is also Common Criteria certified and NIAP Protection Profile compliant. ### Can SteelBox integrate with existing phone systems? Yes, SteelBox can connect to customer PBX, conferencing servers, and PSTN. This allows for extended functionalities such as breakout calling, break-in calling, and conferencing. ### What devices is SteelBox available on? SteelBox is available for iPhone and iPod devices. It is designed for mobile use on these platforms. ### How often is SteelBox updated? The latest version of SteelBox is 5.0.134, which was last updated on April 6, 2023. Updates ensure the app remains secure and functional. ## Version history (last 5 releases) ### 5.0.134 — 2023-04-06 - Retract Messages - Minor enhancements and bug fixes ### 5.0.133 — 2023-03-20 1. Rejoin conversations you were part of after reactivation of your account 2. React to messages with emojis 3. Minor enhancements and bug fixes ### 5.0.125 — 2023-02-21 1. Additional language support 2. Minor enhancements and bug fixes ### 5.0.47 — 2022-10-04 Minor enhancement and bug fixes ### 5.0.42 — 2022-09-06 1. Improvements to minimize duplicate and unnecessary notifications 2. 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