Integrity-aware parallelizable mode (IAPM) is a mode of operation for cryptographic block ciphers. As its name implies, it allows for a parallel mode of operation for higher throughput.
At the time of its creation, IAPM was one of the first cipher modes to provide both authentication and privacy in a single pass.[1][2][3] (In earlier authenticated encryption designs, two passes would be required to: one to encrypt, and the second to compute a MAC.)
IAPM was proposed for use in IPsec.[4]
Other AEAD schemes also provide all of the single pass, privacy and authentication properties. IAPM has mostly been supplanted by Galois/counter mode.
