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IAPM (Integrity Aware Parallelizable Mode) is a mode of operation for cryptographic block ciphers. As its name implies, it allows for a parallel mode of operation for very high throughput.

Encryption and authentication[]

IAPM was the first cipher mode created to provide both authentication and privacy in a single pass. Previously, two passes would be required to achieve both benefits: for example the first pass using DES in CBC mode and the second pass authenticating with HMAC-MD5. IAPM allows for a single pass achieving both authentication and privacy.

OCB mode also provides authentication and privacy in a single pass, and has largely supplanted IAPM for single-pass authenticated-encryption.

IAPM mode was designed by Charanjit Jutla. The OCB inventor, Phillip Rogaway, gives credit to Jutla for inventing the single-pass technique in his #OCB_FAQ.

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