不留記錄即時通訊(Off-the-Record Messaging,縮寫為OTR)是一種安全協定,為即時通訊提供加密保護。OTR使用128bit長度的進階加密標準(AES)對稱金鑰加密保護,1536bits的迪菲-赫爾曼金鑰交換(D-H)與SHA-1函式。在加密與驗證機制之外,OTR同時提供前向保密(Forward secrecy)功能。[1]
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