Sicher

Short description: Instant messaging software

Sicher

Developer(s)| SHAPE GmbH
Initial release| June 2014 (2014-06)
Operating system| Android, iOS, Windows Phone
Type| Instant messaging
License| Freeware
Website| shape.ag

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.[1]

## Contents

* 1 Security
* 2 Privacy
* 3 Controversy
* 4 See also
* 5 References
* 6 External links

## Security

Sicher uses asymmetric point-to-point RSA cryptosystem with 2048 bit long key.[2] 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.[3] 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.

## Privacy

Sicher uses phone number for user authentication due to phone number being a unique identifier that can be easily confirmed and an efficient anti-spam measure. User's address book is used for discovery of Sicher contacts, however address book data is not stored on Sicher servers. User may choose to receive anonymous notifications about new messages, which means that notification on lock screen will not display content of incoming message, including sender's name.[4]

## Controversy

Because Sicher is a closed source proprietary application, it is not possible to verify whether the claimed encryption standards are properly used and well implemented. Furthermore, it can not be verified if the servers are free of intentional or accidental security flaws.[original research?]

## See also

* Comparison of instant messaging clients
* Secure instant messaging

## References

1. ↑ MacLife: IM+ Creators Debut Secure Messaging App Sicher
2. ↑ Sicher FAQ on SHAPE GmbH website
3. ↑ Sicher Privacy Policy
4. ↑ Windows Phone Central: Sicher from the IM+ team promises to keep your messages ‘super-safe'

## External links

* v
* t
* e

Instant messaging

Protocols
(comparison)|

| Open|

* IMPP
* IRC
* Matrix
* MTProto
* RetroShare
* Signal Protocol
* SIP
* MSRP
* SIMPLE
* Tox
* XMPP
* Jingle
* WFP
* Zephyr
* DDP

|

Closed|

* MSNP
* OSCAR
* TOC
* Skype

Services|

* Band
* BBM
* Discord
* Facebook Messenger
* FireChat
* GroupMe
* Hike Messenger
* HipChat
* ICQ
* iGap
* iMessage
* IRC Networks
* Jongla
* KakaoTalk
* Kik
* Libon
* Line
* Marco Polo
* Palringo
* Signal
* Skype
* Slack
* Snapchat
* SNOW
* Tango
* Telegram
* QQ
* Textfree/Pinger
* The Palace
* Threema
* Tox
* Trillian
* Upptalk
* Viber
* Virtual Places Chat
* WeChat
* WhatsApp
* Wickr
* Windows Messenger service
* Yahoo Together
* Zulip

Clients
(comparison)|

| Single protocol|

* Allo
* Baidu Hi
* BBM
* CSipSimple
* Facebook Messenger
* FaceTime
* Fetion
* Gadu-Gadu
* GroupMe
* IBM Sametime
* ICQ
* IMVU
* Jami
* Jongla
* Linphone
* Palringo
* RetroShare
* Ricochet
* Riot.im
* Signal
* Skype
* Telegram
* Tencent QQ
* Tox
* WeChat
* WhatsApp
* Wickr
* Wire

|

Multi-protocol|

* Adium
* Ayttm
* BitlBee
* Centericq
* eBuddy
* Empathy
* Fire
* Instantbird
* Jitsi
* Kopete
* Messages/iChat
* Miranda IM
* Nimbuzz
* Pidgin
* QIP 2010
* Skype for Business
* Trillian
* Telepathy
* Upptalk

XMPP (Jabber)|

* Bombus
* ChatSecure
* Conversations
* Gajim
* Psi
* Tkabber
* Spark

MSNP|

* aMSN
* Skype

Defunct|

* List of defunct instant messaging platforms

See also|

* Backchannel
* Chat log
* Chatbot
* Contact list
* Emoticon
* File sharing
* Instant message service center
* LAN messenger
* Messaging apps
* Presence information
* Shoutbox
* SMS language
* Status message
* Videotelephony
* Voice over IP
* Webcam
* U-Report
* Web chat
* Circuit
* FirstClass
* Flock
* Fuze Box
* Glip
* Hall.com
* Yammer

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