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Sicher
Sicher (German language word meaning "safe", "secure" or "certain") is a freeware instant messaging application for iOS, Android, and Windows Phone. Sicher allows users to exchange end-to-end encrypted text messages, media files and documents in both private and group chats. Sicher is developed by SHAPE GmbH, German company which pioneered mobile messaging with IM+ multi-messenger app it has been offering since 2002.〔(MacLife: IM+ Creators Debut Secure Messaging App Sicher )〕
== Security ==
Sicher uses asymmetric point-to-point RSA cryptosystem with 2048 bit long key.〔(Sicher FAQ on SHAPE GmbH website )〕 All data exchange between mobile apps and Sicher servers is protected using SSL. Company claims that encrypted messages are deleted from servers as soon as they have been delivered to recipient.〔(Sicher Privacy Policy )〕 Lifetime of encrypted data (pictures, voice messages, files) is defined by message self-destruction timer value which has a maximum of 14 days, however the chat participant may choose to manually purge messages. On mobile devices all messages, received files and metadata are encrypted before saving them to internal storage, where application passcode is used as a key to symmetric encryption.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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