OTR
Version 5 (Adrian Georgescu, 09/13/2013 02:01 am)
| 1 | 3 | Adrian Georgescu | h1. Blink OTR implementation |
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| 2 | 1 | Adrian Georgescu | |
| 3 | 5 | Adrian Georgescu | "Blink SIP client for SIP2SIP edition":http://download.sip2sip.info/ is a multimedia SIP client that supports chat sessions using MSRP protocol (RFC4975 http://tools.ietf.org/html/rfc4975). The client is designed to work with SIP2SIP service that implements MSRP relay protocol for NAT traversal of SIP sessions with MSRP media. |
| 4 | 2 | Adrian Georgescu | |
| 5 | 3 | Adrian Georgescu | On top of MSRP session, Blink implements the OTR protocol. |
| 6 | 1 | Adrian Georgescu | |
| 7 | 3 | Adrian Georgescu | h2. OTR Protocol |
| 8 | 3 | Adrian Georgescu | |
| 9 | 3 | Adrian Georgescu | Off-the-Record (OTR) Messaging allows you to have private conversations over instant messaging by providing: |
| 10 | 3 | Adrian Georgescu | |
| 11 | 1 | Adrian Georgescu | h3. Encryption |
| 12 | 1 | Adrian Georgescu | |
| 13 | 1 | Adrian Georgescu | No one else can read your instant messages. |
| 14 | 1 | Adrian Georgescu | |
| 15 | 1 | Adrian Georgescu | h3. Authentication |
| 16 | 3 | Adrian Georgescu | |
| 17 | 1 | Adrian Georgescu | You are assured the correspondent is who you think it is. |
| 18 | 1 | Adrian Georgescu | |
| 19 | 1 | Adrian Georgescu | h3. Deniability |
| 20 | 1 | Adrian Georgescu | |
| 21 | 1 | Adrian Georgescu | The messages you send do not have digital signatures that are checkable by a third party. Anyone can forge messages after a conversation to make them look like they came from you. However, during a conversation, your correspondent is assured the messages he sees are authentic and unmodified. |
| 22 | 1 | Adrian Georgescu | |
| 23 | 1 | Adrian Georgescu | h3. Perfect forward secrecy |
| 24 | 1 | Adrian Georgescu | |
| 25 | 1 | Adrian Georgescu | If you lose control of your private keys, no previous conversation is compromised. |
| 26 | 3 | Adrian Georgescu | |
| 27 | 3 | Adrian Georgescu | h2. Implementation |
| 28 | 3 | Adrian Georgescu | |
| 29 | 4 | Adrian Georgescu | h3. User input |
| 30 | 4 | Adrian Georgescu | |
| 31 | 4 | Adrian Georgescu | * Chat window has the Encryption toolbar icon, encryption features for each session can be controlled by clicking on this toolbar item, a contextual menu appears |
| 32 | 4 | Adrian Georgescu | * Verification of remote identity can be performed using SMP protocol |
| 33 | 4 | Adrian Georgescu | * Each Blink contact can have encrypted related attributes saved (always use OTR, verification status and learned fingerprint) |
| 34 | 4 | Adrian Georgescu | |
| 35 | 4 | Adrian Georgescu | h3. Notifications |
| 36 | 4 | Adrian Georgescu | |
| 37 | 4 | Adrian Georgescu | When remote party has changed its encryption fingerprint several visual and audible clues appear: |
| 38 | 4 | Adrian Georgescu | |
| 39 | 4 | Adrian Georgescu | * Chat window system message is displayed |
| 40 | 4 | Adrian Georgescu | * Voice synthesiser speaks |
| 41 | 4 | Adrian Georgescu | * System notification (OSX >=10.8) |
| 42 | 4 | Adrian Georgescu | * Growl notification |