IAPM (mode)

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Integrity-aware parallelizable mode (IAPM) is a block cipher mode that lets you encrypt data and verify its integrity in a single pass, while still allowing parallel processing for higher speed. When it was introduced, it was one of the first modes to provide both privacy and authentication in one pass; earlier designs needed two passes (one to encrypt, one to compute a MAC). IAPM was proposed for use in IPsec. Today, other AEAD schemes offer the same single-pass privacy and authentication, and IAPM has largely been replaced by Galois/Counter Mode (GCM).