IAPM (mode)

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 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, but both have been supplanted by Galois/Counter Mode.

IAPM mode was designed by Charanjit Jutla. The OCB inventor, Phillip Rogaway, gives credit to Jutla for inventing the single-pass technique.^[1]

Notes

↑ Rogaway's OCB FAQ crediting Jutla

References

C.S. Jutla - A Parallelizable Authenticated Encryption Algorithm for IPsec
Jutla, Charanjit S. (1 August 2000). "Encryption Modes with Almost Free Message Integrity" (PS). Cryptology ePrint Archive. ACR Report 2000/039. Retrieved April 2, 2010.
Jutla, Charanjit S. (6 May 2001). Encryption Modes with Almost Free Message Integrity (PDF). EUROCRYPT 2001. p. 521.

External links

Block ciphers (security summary)

Common algorithms	AES (Implementations) Blowfish DES (Internal Mechanics, Triple DES) Serpent Twofish

Less common algorithms	Camellia CAST-128 IDEA RC2 RC5 SEED Skipjack TEA XTEA

Other algorithms	3-Way Akelarre Anubis ARIA BaseKing BassOmatic BATON BEAR and LION CAST-256 Chiasmus CIKS-1 CIPHERUNICORN-A CIPHERUNICORN-E CLEFIA CMEA Cobra COCONUT98 Crab Cryptomeria/C2 CRYPTON CS-Cipher DEAL DES-X DFC E2 FEAL FEA-M FROG G-DES GOST Grand Cru Hasty Pudding cipher Hierocrypt ICE IDEA NXT Intel Cascade Cipher Iraqi KASUMI KeeLoq KHAZAD Khufu and Khafre KN-Cipher Ladder-DES Libelle LOKI (97, 89/91) Lucifer M6 M8 MacGuffin Madryga MAGENTA MARS Mercy MESH MISTY1 MMB MULTI2 MultiSwap New Data Seal NewDES Nimbus NOEKEON NUSH PRESENT Q RC6 REDOC Red Pike S-1 SAFER SAVILLE SC2000 SHACAL SHARK Simon SMS4 Speck Spectr-H64 Square SXAL/MBAL Threefish Treyfer UES Xenon xmx XXTEA Zodiac

Design	Feistel network Key schedule Lai-Massey scheme Product cipher S-box P-box SPN Avalanche effect Block size Key size Key whitening (Whitening transformation)

Attack (cryptanalysis)	Brute-force (EFF DES cracker) MITM (Biclique attack, 3-Subset MITM attack) Linear (Piling-up lemma) Differential (Impossible Truncated Higher-order) Differential-linear Integral/Square Boomerang Mod n Related-key Slide Rotational Timing XSL Interpolation Partitioning Davies' Rebound Weak key Tau Chi-square Time/memory/data tradeoff

Standardization	AES process CRYPTREC NESSIE

Utilization	Initialization vector Mode of operation Padding

Hash functions & message authentication codes

Security summary

Common functions	MD5 SHA-1 SHA-2 SHA-3/Keccak

SHA-3 finalists	BLAKE Grøstl JH Skein Keccak (winner)

Other functions	FSB ECOH GOST HAS-160 HAVAL LM hash MDC-2 MD2 MD4 MD6 N-Hash RadioGatún RIPEMD SipHash Snefru SWIFFT Tiger VSH WHIRLPOOL crypt(3) (DES)

MAC algorithms	DAA CBC-MAC HMAC OMAC/CMAC PMAC VMAC UMAC Poly1305-AES

Authenticated encryption modes	CCM CWC EAX GCM IAPM OCB

Attacks	Collision attack Preimage attack Birthday attack Brute force attack Rainbow table Distinguishing attack Side-channel attack Length extension attack

Design	Avalanche effect Hash collision Merkle–Damgård construction

Standardization	CRYPTREC NESSIE NIST hash function competition

Utilization	Salt Key stretching

Cryptography

History of cryptography Cryptanalysis Cryptography portal Outline of cryptography

Symmetric-key algorithm Block cipher Stream cipher Public-key cryptography Cryptographic hash function Message authentication code Random numbers Steganography

IAPM (mode)

Encryption and authentication

See also

Notes

References

External links