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Removes Keybase from Encrypted Messaging section

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5_Privacy_Respecting_Software.md
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@ -235,13 +235,14 @@ Without using a secure app for instant messaging, all your conversations, meta d
**[Signal](https://signal.org/)** | Probably one of the most popular, secure private messaging apps that combines strong encryption (see [Signal Protocol](https://en.wikipedia.org/wiki/Signal_Protocol)) with a simple UI and plenty of features. It's widely used across the world, and easy-to-use, functioning similar to WhatsApp - with instant messaging, read-receipts, support for media attachments and allows for high-quality voice and video calls. It's cross-platform, open-source and totally free. Signal is [recommended](https://twitter.com/Snowden/status/661313394906161152) by Edward Snowden, and is a perfect solution for most users
**[Session](https://getsession.org)** | Session is a fork of Signal, however unlike Signal it does not require a mobile number (or any other personal data) to register, instead each user is identified by a public key. It is also decentralized, with servers being run by the community though [Loki Net](https://loki.network), messages are encrypted and routed through several of these nodes. All communications are E2E encrypted, and there is no meta data.
**[Silence](https://silence.im/)** | If you're restricted to only sending SMS/MMS, then Silence makes it easy to encrypt messages between 2 devices. This is important since traditional text messaging is inherently insecure. It's easy-to-use, reliable and secure - but has fallen in popularity, now that internet-based messaging is often faster and more flexible
**[KeyBase](keybase.io/inv/6d7deedbc1)** | KeyBase allows encrypted real-time chat, group chats, and public and private file sharing. It also lets you cryptographically sign messages, and prove your ownership to other social identities (Twitter, Reddit, GitHub, etc), and send or receive Stella or Bitcoin to other users. It's slightly more complex to use than Signal, but it's features extend much further than just a messaging app. Keybase core is built upon some great cryptography features, and it is an excellant choice for managing public keys, signing messages and for group chats.
**[Off-The-Record](https://otr.cypherpunks.ca/)** | Off-the-Record (OTR) Messaging allows you to have private conversations over instant messaging/ [XMPP](https://xmpp.org). It has fallen in popularity in recent years, in favor for simpler, mobile-based messaging apps, but still widely used and secure. It provides: Encryption (so no one else can read your messages), Authentication (assurance that the correspondent is who you think they are), Deniability (After a conversation, it cannot be proved you took part), Perfect Forwards Secrecy (if your keys are compromised, no previous messages can be decrypted). The easiest way to use OTR, is with a [plugin](https://otr.cypherpunks.ca/software.php) for your IM client
**[OpenPGP](https://www.openpgp.org/)** | Provides cryptographic privacy and authentication, PGP is used to encrypt messages sent over existing chat networks (such as email or message boards). Slightly harder to use (than IM apps), slower, but still widely used. Using [GnuPG](https://gnupg.org/download/index.html), encrypts messages following the OpenPGP standard, defined by the IETF, proposed in [RFC 4880](https://tools.ietf.org/html/rfc4880) (originally derived from the PGP software, created by Phil Zimmermann, now owned by [Symantec](https://www.symantec.com/products/encryption)). <br>**Note/ Issues with PGP** PGP is [not easy](https://restoreprivacy.com/let-pgp-die/) to use for beginners, and could lead to human error/ mistakes being made, which would be overall much worse than if an alternate, simpler system was used. Do not use [32-bit key IDs](https://evil32.com/) - they are too short to be secure. There have also been vulnerabilities found in the OpenPGP and S/MIME, defined in [EFAIL](https://efail.de/), so although it still considered secure for general purpose use, it may be better to use an encrypted messaging or email app instea - especially for sensitive communications.
#### Other Notable Mentions
Other private, encrypted and open source messaging apps include: [Surespot](https://www.surespot.me), [Chat Secure](https://chatsecure.org/) (iOS only) and [Status](https://status.im/). Note that [Tor Messenger](https://blog.torproject.org/category/tags/tor-messenger)s been removed from the list, since development has halted.
[KeyBase](keybase.io/inv/6d7deedbc1)allows encrypted real-time chat, group chats, and public and private file sharing. It also has some nice features around cryptographically proving social identities, and makes PGP signing, encrypting and decrypting messages easy. However, since it was [acquired by Zoom](https://keybase.io/blog/keybase-joins-zoom) in 2020, it has no longer been recieving regular updates.
#### Word of Warning
Many messaging apps claim to be secure, but if they are not open source, then this cannot be verified - and they **should not be trusted**. This applies to [Telegram](https://telegram.org), [Threema](https://threema.ch), [Cypher](https://www.goldenfrog.com/cyphr), [Wickr](https://wickr.com/), [Silent Phone](https://www.silentcircle.com/products-and-solutions/silent-phone/) and [Viber](https://www.viber.com/), to name a few - these apps should not be used to communicate any sensitive data. [Wire](https://wire.com/) has also been removed, due to a [recent acquisition](https://blog.privacytools.io/delisting-wire/)