IAPM (mode)

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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.

1 Encryption and authentication
2 See also
3 Notes
4 References
5 External links

Encryption and authentication

IAPM was the first cipher mode created to provide both authentication and privacy in a single pass.^{[citation needed]} 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

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References

C.S. Jutla - A Parallelizable Authenticated Encryption Algorithm for IPsec
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External links

v t e Block ciphers (security summary)
Common algorithms	AES Blowfish DES (internal mechanics, Triple DES) Serpent Twofish
Less common algorithms	ARIA Camellia CAST-128 GOST IDEA LEA RC2 RC5 RC6 SEED Skipjack TEA XTEA
Other algorithms	3-Way Akelarre Anubis 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 Grand Cru Hasty Pudding cipher Hierocrypt ICE IDEA NXT Intel Cascade Cipher Iraqi Kalyna KASUMI KeeLoq KHAZAD Khufu and Khafre KN-Cipher Kuznyechik Ladder-DES 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 Prince Q REDOC Red Pike S-1 SAFER SAVILLE SC2000 SHACAL SHARK Simon SM4 Speck Spectr-H64 Square SXAL/MBAL Threefish Treyfer UES xmx XXTEA Zodiac
Design	Feistel network Key schedule Lai–Massey scheme Product cipher S-box P-box SPN Confusion and diffusion Round 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 Distinguishing (Known-key) Integral/Square Boomerang Mod n Related-key Slide Rotational Side-channel Timing Power-monitoring Electromagnetic Acoustic Differential-fault XSL Interpolation Partitioning Rubber-hose Black-bag Davies Rebound Weak key Tau Chi-square Time/memory/data tradeoff
Standardization	AES process CRYPTREC NESSIE
Utilization	Initialization vector Mode of operation Padding

v t e 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 Kupyna LM hash MDC-2 MD2 MD4 MD5 MD6 N-Hash RadioGatún RIPEMD SipHash Snefru Streebog SWIFFT Tiger VSH WHIRLPOOL crypt(3) (DES)
MAC algorithms	DAA CBC-MAC HMAC OMAC/CMAC PMAC VMAC UMAC Poly1305
Authenticated encryption modes	CCM CWC EAX GCM IAPM OCB
Attacks	Collision attack Preimage attack Birthday attack Brute force attack Rainbow table 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 Message authentication
Key derivation functions	bcrypt PBKDF2 scrypt

v t e Cryptography
History of cryptography Outline of cryptography Cryptographic protocol Authentication protocol Cryptographic primitive Cryptanalysis Cryptocurrency Cryptosystem Cryptographic nonce Cryptovirology Hash function Cryptographic hash function Key derivation function Digital signature Kleptography Key (cryptography) Key exchange Key generator Key schedule Key stretching Keygen Cryptojacking malware Ransomware Random number generation Cryptographically secure pseudorandom number generator (CSPRNG) Pseudorandom noise (PRN) Secure channel Insecure channel Subliminal channel Encryption Decryption End-to-end encryption Harvest now, decrypt later Information-theoretic security Plaintext Codetext Ciphertext Shared secret Trapdoor function Trusted timestamping Key-based routing Onion routing Garlic routing Kademlia Mix network
Cryptographic hash function Block cipher Stream cipher Symmetric-key algorithm Authenticated encryption Public-key cryptography Quantum key distribution Quantum cryptography Post-quantum cryptography Message authentication code Random numbers Steganography
Category

↑ Rogaway's OCB FAQ crediting Jutla

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