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Adds note to PGP: Do not use 32-bit key IDs

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5_Privacy_Respecting_Software.md
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@ -211,7 +211,7 @@ Without using a secure app for instant messaging, all your conversations, meta d
**[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 **[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. **[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 **[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. 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 instead- especially for sensitive communications. **[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 instead- especially for sensitive communications.
#### Other Notable Mentions #### 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. 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.