咔信 vs Kuxin IM

咔信是一款私有化部署安全通信系统，是用户自主可控的加密通讯工具。通信服务器使用高强度密码算法进行端到端加密，可全面、有效地保护用户即时通信的隐私安全。 功能特色： 高强度的数据加密：所有发送、接收的信息（文本、语音、图像、文件）高强度国密加密；加密语音通话，确保紧急事项高效沟通。 身份认证：白名单身份认证，确保用户身份真实可信。 终端数据防泄密：敏感信息可用阅后即焚防止信息外泄；手机不慎丢失，管理员可在管理后台“远程删除”手机数据，防止信息泄露。 重要文档安全管控：“安全文档”实现对重要文档加密后发送，只有指定的接收方才能打开，阅读及转发，通过权限控制、阅读与传播轨迹记录、内嵌水印保证泄密可追查等手段实现文档安全管控。

This is an original instant messaging software with stable performance and comprehensive functions. It features: 1. High availability: the server does not need to be restarted for half a year, and automatic load balancing 2. Full functions: mainstream IM has all the functions, and we have none 3. Private cloud: support private deployment and deep customization, not controlled by others 4. High security: communication protocol adopts high-strength encryption algorithm, and chat records are not leaked 5. High freedom: the user-defined protocol is simple and clear, and there are no more restrictions 6. High speed: Based on protobuf's binary byte format, the package is very small, the data volume is small, the transmission speed is fast, and the bandwidth occupation is low 7. High concurrency: the measured concurrency is more than 30W, 2-5 times that of general IM, and supports hundreds of millions of users when clustering 8. Support appointment meeting, voice conference, video conference, shared desktop, text chat in the meeting, member management, etc Specific functions include: 1. Address book, supporting friend verification or not, QR code, tag grouping, blacking, my colleagues, official account, multi sign on, my mobile phone sending messages to my computer, etc 2. Single chat, support message receipt, burn after reading, display read, message interference free, top setting, withdrawal, video chat, search chat record, etc 3. Group chat, support announcement, @ group members, group sharing, group entry verification, group nickname, group management, number of readers, video conference, etc., support 10000 people 4. Message, support long text, picture, audio recording, video recording, business card, location, animation, file, red envelope, screenshot and other types 5. Privacy, delivered, read, burned after reading, end-to-end encryption, private group, non-public group members and other features are exclusive