libotr ☆
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Description:
Off-The-Record (OTR) messaging library
Type: Formula  |  Latest Version: 4.1.1@0  |  Tracked Since: Dec 20, 2025
Links: Homepage  |  formulae.brew.sh
Category: Security
Tags: encryption security messaging library privacy otr
Install: brew install libotr
About:
libotr is a library that implements the Off-The-Record (OTR) messaging protocol, providing encryption, authentication, and perfect forward secrecy for instant messaging. It allows developers to integrate secure, deniable private conversations into their chat applications, ensuring that third parties cannot read stored communications.
Key Features:
  • Implements the Off-The-Record (OTR) protocol v3 and v4
  • Provides strong encryption and perfect forward secrecy
  • Supports message authentication and deniability
  • Portable C library with minimal dependencies
Use Cases:
  • Integrating end-to-end encryption into instant messaging clients
  • Securing real-time text conversations over insecure networks
  • Developing privacy-focused communication software
Alternatives:
  • libsignal-protocol – Provides modern ratcheting for continuous encryption but is more complex to implement than OTR.
  • OMEMO – A multi-end message protocol based on the Double Ratchet algorithm, often preferred for multi-device support.
Version History
Detected Version Rev Change Commit
Dec 20, 2025 6:24pm 4.1.1 0 VERSION_BUMP 21f26887
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