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توضیحات

Send and receive messages encrypted with Axolotl (Double Ratchet) protocol

ویژگی	مقدار
سیستم عامل	OS Independent
نام فایل	Pyxolotl-0.2
نام	Pyxolotl
نسخه کتابخانه	0.2
نگهدارنده	[]
ایمیل نگهدارنده	[]
نویسنده	Michal Krenek (Mikos)
ایمیل نویسنده	m.krenek@gmail.com
آدرس صفحه اصلی	https://github.com/xmikos/pyxolotl
آدرس اینترنتی	https://pypi.org/project/Pyxolotl/
مجوز	GNU GPLv3

Pyxolotl ======== Send and receive messages encrypted with `Axolotl (Double Ratchet) <https://github.com/trevp/double_ratchet/wiki>`_ protocol Description ----------- Pyxolotl allows you to send and receive secure end-to-end encrypted messages with `perfect forward and future secrecy <https://whispersystems.org/blog/advanced-ratcheting/>`_ over any channel (email, IM, IRC, Twitter, Hangouts, Facebook, etc.). It uses same `Axolotl (Double Ratchet) <https://github.com/trevp/double_ratchet/wiki>`_ protocol as Signal messaging app by Open Whisper Systems. Protocol -------- Actual wire protocol is described `here <https://github.com/xmikos/pyxolotl/wiki/ProtocolV2>`_. Headers (for differentiating between standard message and key exchange message) are obfuscated with 100000 iterations of PBKDF2 (with whole encrypted message used as salt). This should make identifying Pyxolotl messages very resource-intensive to impede mass surveillance or filtering. Key exchange ------------ Pyxolotl is serverless, all messages are sent P2P, so it doesn't use `prekeys <https://whispersystems.org/blog/asynchronous-security/>`_. You must first send initial key exchange message to recipient and wait for his reply before sending actual message (this is same as `SMS Transport <https://github.com/xmikos/pyxolotl/wiki/ProtocolV2#keyexchangemessage-sms-transport-only>`_ in older versions of TextSecure and in SMSSecure / Silence). Once this initial key exchange is completed, both parties can send messages to each other without any other inconveniences. Security model is `TOFU <https://en.wikipedia.org/wiki/Trust_on_first_use>`_ (Trust On First Use), both parties should compare public keys via independent secure channel to mitigate potential MITM attack during initial key exchange. Transports ---------- Pyxolotl have pluggable transports. For now there is only *plaintext* transport (which prints encoded messages to terminal) and *email* transport (messages are encoded to / decoded from well-formed MIME emails). Encodings --------- Encrypted messages can use different transport encodings. For now there is standard *Base64* encoding (without padding) and as a curiosity *mnemonic* encoding (based on `BIP-0039: Mnemonic code for generating deterministic keys <https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki>`_ which encodes encrypted messages as a sequence of words). Mnemonic encoding is inefficient (messages are about 3.5x larger than Base64), but it can add another layer of obfuscation against mass surveillance or filtering. Local encryption ---------------- Local database (private key, sessions, etc.) is encrypted with AES-CBC using 256-bit key derived from passphrase (with 100000 iterations of PBKDF2 and random salt) and authenticated with HMAC-SHA256. Requirements ------------ - Python >= 3.3 - enum (https://pypi.python.org/pypi/enum) for Python < 3.4 - python-axolotl (https://github.com/tgalal/python-axolotl) - python-axolotl-curve25519 (https://github.com/tgalal/python-axolotl-curve25519) - protobuf (https://github.com/google/protobuf) >= 2.6 - pycrypto (https://github.com/dlitz/pycrypto) Usage ----- Run ``pyxolotl --help`` to see all available options. Help ---- :: usage: pyxolotl [-h] [-d] [-t {plaintext,email}] [-e {base64,mnemonic}] [--log LOG] [--db DB] [--config CONFIG] [--version] [-a ADDRESS] [-s SUBJECT] {list,ls,send,receive,recv,exchange,delete,del,rm,passwd} ... send and receive messages encrypted with Axolotl protocol optional arguments: -h, --help show this help message and exit -d, --debug log detailed debugging messages (default: False) -t {plaintext,email}, --transport {plaintext,email} choose message transport (default: plaintext) -e {base64,mnemonic}, --encoder {base64,mnemonic} choose message encoding (default: base64) --log LOG log file path (default: ~/.local/share/pyxolotl/pyxolotl.log) --db DB database file path (default: ~/.local/share/pyxolotl/pyxolotl.db) --config CONFIG configuration file path (default: ~/.local/share/pyxolotl/pyxolotl.json) --version show program's version number and exit email transport: -a ADDRESS, --address ADDRESS your own email address (default: None) -s SUBJECT, --subject SUBJECT subject of sent emails (default: None) commands: run `pyxolotl COMMAND --help` to see help message for specific command {list,ls,send,receive,recv,exchange,delete,del,rm,passwd} available commands list (ls) list known identities send send message to recipient receive (recv) receive message from sender exchange start initial key exchage with recipient delete (del, rm) end session with recipient passwd change passphrase to local storage Todo: ----- - write more transports (especially Google Hangouts, Twitter Direct Messages, Facebook Messenger, IRC and XMPP) - make email transport more complete (sending with SMTP, receiving with IMAP IDLE) - create IM-like console UI (with ``asyncio`` and `Urwid <http://urwid.org/>`_) - create IM-like Qt 5/QML based GUI - add support for multiple devices - add support for group messages - add support for verifying identity with question (using `socialist millionaire <https://en.wikipedia.org/wiki/Socialist_millionaire>`_ protocol) Example ------- :: [alice@nsa.gov ~]$ pyxolotl exchange bob SEND: To: bob Encrypted message: 4uJ8zyMIwSgSIQUuLKlC8WdspRietP45P6nFU6/50wT4cQYxNw4vvqKLHxohBYLC5sDLZ78syjQIMf9PA+3Q9MGootUvOajaZA3thspDIiEF6sSiWxB6l0B4oE7gcMl1T3W+hzI548U46cYrR5KUjXY [bob@fsb.ru ~]$ pyxolotl receive RECEIVE: From: alice Encrypted message: 4uJ8zyMIwSgSIQUuLKlC8WdspRietP45P6nFU6/50wT4cQYxNw4vvqKLHxohBYLC5sDLZ78syjQIMf9PA+3Q9MGootUvOajaZA3thspDIiEF6sSiWxB6l0B4oE7gcMl1T3W+hzI548U46cYrR5KUjXY Received initial key exchange request! Send this reply to complete key exchange: SEND: To: alice Encrypted message: 0yx89TMIwigSIQVN+wtEio0h+Zx7WPcIwM9WreOy0r7eETBclhOtDAvANhohBb4qfe8R05/167DQDdd2Gqp5OrxAPcriwJMtzi+2b7QrIiEFhfVGHlCm6b1SX36V1HeFX4pAeW15v1aLb2nGi57NZFAqQD3rKGjPDCCm1Kj6i8GUnf4MAc56fhRIYhUJH2mSvlcSAl2XotmR2Yz2lY0wa7TW1JnmUX+YBbIEgIHk0gQ9Log [alice@nsa.gov ~]$ pyxolotl receive RECEIVE: From: bob Encrypted message: 0yx89TMIwigSIQVN+wtEio0h+Zx7WPcIwM9WreOy0r7eETBclhOtDAvANhohBb4qfe8R05/167DQDdd2Gqp5OrxAPcriwJMtzi+2b7QrIiEFhfVGHlCm6b1SX36V1HeFX4pAeW15v1aLb2nGi57NZFAqQD3rKGjPDCCm1Kj6i8GUnf4MAc56fhRIYhUJH2mSvlcSAl2XotmR2Yz2lY0wa7TW1JnmUX+YBbIEgIHk0gQ9Log Initial key exchange completed! [alice@nsa.gov ~]$ pyxolotl ls Your public key: 05eac4a25b107a974078a04ee070c9754f75be873239e3c538e9c62b4792948d76 Existing sessions: Identity: bob, Pending key exchange: False Public key: 0585f5461e50a6e9bd525f7e95d477855f8a40796d79bf568b6f69c68b9ecd6450 [bob@fsb.ru ~]$ pyxolotl ls Your public key: 0585f5461e50a6e9bd525f7e95d477855f8a40796d79bf568b6f69c68b9ecd6450 Existing sessions: Identity: alice, Pending key exchange: False Public key: 05eac4a25b107a974078a04ee070c9754f75be873239e3c538e9c62b4792948d76 [alice@nsa.gov ~]$ pyxolotl send bob Message: Hello Bob! SEND: To: bob Encrypted message: a74TljMKIQWJl7sz1bTEIhF/7nwKBLRi7XeEpzcur7t/MOixAOfbHRAAGAAiEEgco7NQXppy/qsm5TdJllpW+nTQ1QjVsQ [bob@fsb.ru ~]$ pyxolotl receive RECEIVE: From: alice Encrypted message: a74TljMKIQWJl7sz1bTEIhF/7nwKBLRi7XeEpzcur7t/MOixAOfbHRAAGAAiEEgco7NQXppy/qsm5TdJllpW+nTQ1QjVsQ DECRYPTED: Hello Bob! [bob@fsb.ru ~]$ pyxolotl send alice Message: Hello Alice! SEND: To: alice Encrypted message: Zd/HKjMKIQXLGyTr5AcvrpUhfR2H7bYqLXqVy7GpE84VvFFkm1LDbxAAGAAiEJDC8/kM59yVzNeCBtjDVOe1CHWuFDbhYg [alice@nsa.gov ~]$ pyxolotl receive RECEIVE: From: bob Encrypted message: Zd/HKjMKIQXLGyTr5AcvrpUhfR2H7bYqLXqVy7GpE84VvFFkm1LDbxAAGAAiEJDC8/kM59yVzNeCBtjDVOe1CHWuFDbhYg DECRYPTED: Hello Alice!

نحوه نصب

نصب پکیج whl Pyxolotl-0.2:

pip install Pyxolotl-0.2.whl

نصب پکیج tar.gz Pyxolotl-0.2:

pip install Pyxolotl-0.2.tar.gz