Cipher security summary

This article summarizes publicly known attacks against block ciphers. Note that not all entries may be up to date.

Table color key
No known attacks
Theoretical break
Attack demonstrated in practice

Common block ciphers

Cipher	Security claim	Best attack	Attack date	Comment
AES128	2¹²⁸	?
AES192	2¹⁹²	2¹⁷⁶ time, 2¹²³ data, 2¹⁵² memory, 4 related keys	2009-12-04^[1]
AES256	2²⁵⁶	2^99.5 time, 2^99.5 data, 2⁷⁷ memory, 4 related keys	2009-12-04^[1]
Blowfish	2⁴⁴⁸	?
DES	2⁵⁶	2⁵⁶ time	1998-07-17^[2]	Broken by brute force, see EFF DES cracker. Off-the-shelf hardware is available for $10,000.^[3]
Triple DES	2¹⁶⁸	2¹¹³ time, 2³² data, 2⁸⁸ memory	1998-03-23^[4]
Serpent	2¹²⁸..2²⁵⁶	?
Twofish	2¹²⁸..2²⁵⁶	?

Less common ciphers

Cipher	Security claim	Best attack
CAST-128	2¹²⁸	?
IDEA	2¹²⁸	?
RC2	2⁶⁴..2¹²⁸	?
RC5	2¹²⁸	?
SEED	2¹²⁸	?
Skipjack	2⁸⁰	?
TEA	2¹²⁸	?
XTEA	2¹²⁸	?

References

^ ^a ^b Biryukov, Alex (2009-12-04). "Related-key Cryptanalysis of the Full AES-192 and AES-256". {{cite web}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
^ "DES Cracker Project". EFF. On Wednesday, July 17, 1998 the EFF DES Cracker, which was built for less than $250,000, easily won RSA Laboratory's "DES Challenge II" contest and a $10,000 cash prize.
^ "COPACOBANA – Special-Purpose Hardware for Code-Breaking".
^ {{cite paper |author=Stefan Lucks |date=1998-03-23 |title=Attacking Triple Encryption |url=http://th.informatik.uni-mannheim.de/People/Lucks/papers/pdf/3des.pdf.gz

v t e Block ciphers (security summary)
Common algorithms	AES Blowfish DES (internal mechanics, Triple DES) Serpent SM4 Twofish
Less common algorithms	ARIA Camellia CAST-128 GOST IDEA LEA RC5 RC6 SEED Skipjack TEA XTEA
Other algorithms	3-Way Adiantum Akelarre Anubis Ascon 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 QARMA RC2 REDOC Red Pike S-1 SAFER SAVILLE SC2000 SHACAL SHARK Simon 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 NSA Suite B CNSA
Utilization	Initialization vector Mode of operation Padding

v t e Cryptography
General	History of cryptography Outline of cryptography Classical cipher Cryptographic protocol Authentication protocol Cryptographic primitive Cryptanalysis Cryptocurrency Cryptosystem Cryptographic nonce Cryptovirology Hash function Cryptographic hash function Key derivation function Secure Hash Algorithms Digital signature Kleptography Key (cryptography) Key exchange Key generator Key schedule Key stretching Keygen Machines 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
Mathematics	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

Common block ciphers

Less common ciphers

See also

References