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Cryptographic attack
cryptography, a collision attack on a cryptographic hash tries to find two inputs producing the same hash value, i.e. a hash collision. This is in contrast
Collision_attack
Cryptographic hash function
February 2017, CWI Amsterdam and Google announced they had performed a collision attack against SHA-1, publishing two dissimilar PDF files which produced the
SHA-1
Message-digest hashing algorithm
collision. (Previous collision discoveries had relied on multi-block attacks.) For "security reasons", Xie and Feng did not disclose the new attack method
MD5
Type of cryptographic attack
birthday attack is a brute-force collision attack that exploits the mathematics behind the birthday problem in probability theory. This attack can be used
Birthday_attack
Attack model against cryptographic hash functions
collision resistance does imply preimage resistance (by a provisional implication). Conversely, a second-preimage attack implies a collision attack (trivially
Preimage_attack
Hash function phenomenon
Instances where bad actors attempt to create or find hash collisions are known as collision attacks. In practice, security-related applications use cryptographic
Hash_collision
Password cracking dataset
the hands of attackers, they can use a precomputed rainbow table to recover the plaintext passwords. A common defense against this attack is to compute
Rainbow_table
Cryptographic hash function
first full collision attack against MD4 was published in 1995, and several newer attacks have been published since then. As of 2007, an attack can generate
MD4
Set of cryptographic hash functions
minimally affected by a collision attack. Constructing a password that works for a given account requires a preimage attack, as well as access to the
SHA-2
Property of cryptographic hash functions
brute-force attack, it is typically considered a flaw in the hash function. Cryptographic hash functions are usually designed to be collision resistant
Collision_resistance
Computer communications authentication algorithm
("length-extension attack"). The alternative, appending the key using MAC = H(message ∥ key), suffers from the problem that an attacker who can find a collision in the
HMAC
Method of building collision-resistant cryptographic hash functions
Merkle–Damgård hash function is a method of building collision-resistant cryptographic hash functions from collision-resistant one-way compression functions. This
Merkle–Damgård_construction
Publicly known attacks against cryptographic hash functions
Collision attack Preimage attack Length extension attack Cipher security summary Tao Xie; Fanbao Liu; Dengguo Feng (25 March 2013). "Fast Collision Attack
Hash function security summary
Hash_function_security_summary
Random data used as an additional input to a hash function
defend against attacks that use precomputed tables (e.g. rainbow tables), by vastly growing the size of table needed for a successful attack. It also helps
Salt_(cryptography)
Key derivation function
possible to trivially construct any number of different password pairs with collisions within each pair. If a supplied password is longer than the block size
PBKDF2
Hash functions
a hash table of practical size, then no algorithm can prevent collisions; an attacker need only make as many attempts as there are possible outputs.
SipHash
Set of cryptographic hash functions
d-bit output should have d/2-bit resistance to collision attacks and d-bit resistance to preimage attacks, the maximum achievable for d bits of output.
SHA-3
Type of data structure
second-preimage attack in which an attacker creates a document other than the original that has the same Merkle hash root. For the example above, an attacker can
Merkle_tree
Family of cryptographic hash functions
bench.cr.yp.to. Tao, Xie; Liu, Fanbao; Feng, Dengguo (2013). Fast Collision Attack on MD5 (PDF). Cryptology ePrint Archive (Technical report). IACR. Stevens
Secure_Hash_Algorithms
Cryptanalytic method for unauthorized users to access data
In cryptography, a brute-force attack or exhaustive key search is a cryptanalytic attack that consists of an attacker submitting many possible keys or
Brute-force_attack
Password-based key derivation function
in 1999. Besides incorporating a salt to protect against rainbow table attacks, bcrypt is an adaptive function: over time, the iteration count can be
Bcrypt
System that regulates the formation of blocks on a blockchain
Moni Naor and Cynthia Dwork in 1993 as a way to deter denial-of-service attacks and other service abuses such as spam on a network by requiring some work
Proof_of_work
2015 password-based key derivation function
time–memory trade-off (TMTO) attacks, but introduces possible side-channel attacks. Argon2i is optimized to resist side-channel attacks. It accesses the memory
Argon2
Encryption method
Encrypt-then-MAC approach) implies security against an adaptive chosen ciphertext attack, provided that both functions meet minimum required properties. Katz and
Authenticated_encryption
Cryptographic hash function
an improved collision attack was found based on the technique from the previous best collision attack, this improved collision attack could reach 40
RIPEMD
Attack against cryptographical hash functions
to a length extension attack, but is vulnerable to another attack based on a hash collision. The vulnerable hashing functions work by taking the input
Length_extension_attack
Authenticated encryption mode for block ciphers
number of platforms. Käsper and Schwabe described a "Faster and Timing-Attack Resistant AES-GCM" that achieves 10.68 cycles per byte of AES-GCM authenticated
Galois/Counter_Mode
Authenticated encryption with associated data algorithm
to timing attacks. To be noted, when the SSH protocol uses ChaCha20-Poly1305 as underlying primitive, it is vulnerable to the Terrapin attack. Authenticated
ChaCha20-Poly1305
Hash function that is suitable for use in cryptography
required for pre-image resistance; otherwise, collisions may be found by a birthday attack. Collision resistance implies second pre-image resistance
Cryptographic_hash_function
Practice and study of secure communication techniques
(for example such as that of a drive which has been securely wiped). Collision attack Comparison of cryptography libraries Cryptovirology – Securing and
Cryptography
Obsolete cryptographic hash function
presented in 1995 collisions of MD2's compression function, although they were unable to extend the attack to the full MD2. The described collisions was published
MD2_(hash_function)
Cryptographic hash function
attacks by describing a collision attack spanning 19 rounds of Tiger, and a 22-round pseudo-near-collision attack. These attacks require a work effort equivalent
Tiger_(hash_function)
Information used for message authentication and integrity checking
able to control the MAC key, stronger guarantees are needed, akin to collision resistance or preimage security in hash functions. For MACs, these concepts
Message_authentication_code
Model for disclosing computer security vulnerabilities
security vulnerabilities resolved by applying coordinated disclosure: MD5 collision attack that shows how to create false CA certificates, 1 week Starbucks gift
Coordinated vulnerability disclosure
Coordinated_vulnerability_disclosure
Ukrainian cryptographic hash function
Dobraunig, Maria Eichlseder, and Florian Mendel describe a collision attack using rebound attack on Kupyna-256 reduced to 4 rounds with time complexity 267
Kupyna
Key derivation function based on an HMAC
if an attacker can influence the IKMs source in a way that specifically exploits HKDF-Extract's underlying hash function (finding a collision or a specific
HKDF
Russian cryptographic hash function
describe a collision attack with 2181 time complexity and 264 memory requirement in the same paper. Guo, et al, describe a second preimage attack on full
Streebog
Concept in cryptography
the hash function being exposed to attacks including collision attacks, length extension attacks, and preimage attacks. Constructing a cipher or hash to
Avalanche_effect
Cryptography algorithm
chosen-plaintext attack in many cases, since the attacker may be able to manipulate the entire IV–counter pair to cause a collision. Once an attacker controls
Block cipher mode of operation
Block_cipher_mode_of_operation
Authenticated encryption mode of operation for block ciphers
developed and not sold inside the U.S. Niels Ferguson pointed out collision attacks on OCB, which limits the amount of data that can be securely processed
OCB_mode
Cryptographic hash function
weight (45-bit) pseudo-collision attack on the Shabal compression function with time complexity 284 was presented. A preimage attack with 2497 time and 2400
Shabal
Entity that issues digital certificates
broken MD5 hash algorithm. The authors thus was able to conduct a collision attack with the hash listed in the certificate. In 2015, a Chinese certificate
Certificate_authority
Method of negotiating credentials between web server and browser
cryptographic construction that is used is based on the MD5 hash function, collision attacks were in 2004 generally believed to not affect applications where the
Digest_access_authentication
Any attack based on information gained from the implementation of a computer system
In computer security, a side-channel attack is a type of security exploit that uses information inadvertently leaked by a system—such as timing, power
Side-channel_attack
Cryptographic hash primitive
present a way of generating collisions with the 1-bit version of the algorithm using an attack that needs 224.5 operations. The attack can not be extended to
RadioGatún
Universal hash family used for message authentication in cryptography
the attacker sees 264 messages authenticated under a Poly1305-AES key; that the attacker attempts a whopping 275 forgeries; and that the attacker cannot
Poly1305
Message authentication code algorithm
=C_{i}'} . This example also shows that a CBC-MAC cannot be used as a collision-resistant one-way function: given a key it is trivial to create a different
CBC-MAC
Incident when a vehicle collides with another object
advises against it in their Road Collision Reporting Guidelines. Some collisions are intentional vehicle-ramming attacks, staged crashes, vehicular homicide
Traffic_collision
2009 password-based key derivation function
specifically designed to make it costly to perform large-scale custom hardware attacks by requiring large amounts of memory. In 2016, the scrypt algorithm was
Scrypt
Authenticated encryption mode for block ciphers
Authenticated encryption EAX mode Galois/Counter Mode Stream cipher Stream cipher attacks CCMP Dworkin, Morris (May 2004). Recommendation for Block Cipher Modes
CCM_mode
Cryptographic secret, not public in contrast to salt
reuse or other attack) along with a user's salt can lead to an attack to discover the pepper, rendering it ineffective. If an attacker knows a plaintext
Pepper_(cryptography)
Tables comparing general and technical information for common hashes
304-bit hash when looking at preimage attacks, but the security of a 608-bit hash when looking at collision attacks. The 64-bit version, likewise, has the
Comparison of cryptographic hash functions
Comparison_of_cryptographic_hash_functions
referred to as weak collision resistance. Functions that lack this property are vulnerable to second pre-image attacks. Collision resistance: it should
Security of cryptographic hash functions
Security_of_cryptographic_hash_functions
Standard for cryptographic certificates
"SHA-1 collisions now" (PDF). Macquarie University and Qualcomm. Retrieved 10 September 2020. Dennis Dwyer (2 June 2009). "SHA-1 Collision Attacks Now 252"
X.509
Cryptographic hash function
Mendel, Florian; Rijmen, Vincent; Schläffer, Martin (2014-04-30), "Collision Attack on 5 Rounds of Grøstl", Cryptology ePrint Archive, Report 2014/305
Grøstl
Cryptographic hash function
The designers claim advanced proofs of resistance to differential collision attacks for this improved version. A complete specification can be found at
Fugue_(hash_function)
Cryptographic primitive
(m_{2})} . Due to the birthday paradox (see also birthday attack) there is a 50% chance a collision can be found in time of about 2 n / 2 {\displaystyle 2^{n/2}}
One-way_compression_function
Property of cryptographic hash functions
cryptographic hash functions is used in Bitcoin mining. Collision resistance Collision attack Preimage attack Arvind Narayanan, Joseph Bonneau, Edward Felten
Puzzle_friendliness
Cryptographic hash function
another way how to find second pre-images and thus collisions, Wagner's generalized birthday attack. ECOH is a good example of hash function that is based
Elliptic_curve_only_hash
Competition to develop SHA-3
December 15, 2008. Anne Canteaut & María Naya-Plasencia. "Internal collision attack on Maraca" (PDF). Retrieved December 15, 2008. Michael P. Frank. "Algorithm
NIST hash function competition
NIST_hash_function_competition
Cryptographic hash function
October 2010, an attack that combines rotational cryptanalysis with the rebound attack was published. The attack finds rotational collisions for 53 of 72
Skein_(hash_function)
Theory of cryptography
transformation function f. In hash applications, resistance to collision or preimage attacks depends on C, and its size (the "capacity" c) is typically twice
Sponge_function
Cryptographic hash function
secure means that finding collisions is as difficult as some known hard mathematical problem. Unlike other provably secure collision-resistant hashes, VSH
Very_smooth_hash
Modular computer malware discovered in 2012
successful collision attack against a certificate was previously demonstrated in 2008, but Flame implemented a new variation of the chosen-prefix collision attack
Flame_(malware)
Cryptographic hash function
Adi Shamir who were able to use differential cryptanalysis to find hash collisions. The design was then modified by increasing the number of iterations of
Snefru
Cryptographic hash function
bits and 3 passes with 26 operations) questionable. On 17 August 2004, collisions for HAVAL (128 bits, 3 passes) were announced by Xiaoyun Wang, Dengguo
HAVAL
Message authentication code algorithm
Kim, Jaechul Sung, Seokhie Hong, Sangjin Lee. "Forgery and Key Recovery Attacks on PMAC and Mitchell's TMAC Variant", 2006. [1] (ps) Rust implementation
PMAC_(cryptography)
Techniques to protect against brute-force attack
typically a password or passphrase, more secure against a brute-force attack by increasing the resources (time and possibly space) it takes to test each
Key_stretching
Traffic collision in Liverpool, England
arrested for attempted murder, dangerous driving and drug offences after collision". Sky News. 27 May 2025. Retrieved 27 May 2025. Gawne, Ewan (29 May 2025)
2025_Liverpool_parade_attack
Cryptographic hash function
differential cryptanalysis to N-hash, and showed that collisions could be generated faster than by a birthday attack for N-hash variants with even up to 12 rounds
N-hash
1986 railway accident near Hinton, Alberta, Canada
The Hinton train collision was a railway accident that occurred in what is now Yellowhead County, Alberta, Canada, on February 8, 1986. Twenty-three people
Hinton_train_collision
Cryptographic hash function
the proof that the submitted version of MD6 is resistant to differential attacks", and an inability to supply such a proof for a faster reduced-round version
MD6
revealed various weaknesses, including feasible brute-force attacks, existence of collision clusters, and key-recovery techniques. For this reason, MAA
Message Authenticator Algorithm
Message_Authenticator_Algorithm
System to verify the source and or authenticity of a message
generated to avoid its recovery through brute-force searches and related-key attacks designed to identify it from the messages transiting the medium. Some cryptographers
Message_authentication
Design method for cryptographic hash functions
Merkle–Damgård construction, avoiding its weaknesses like length extension attacks. The construction was designed by Eli Biham and Orr Dunkelman in 2007.
HAIFA_construction
2001 terror attacks in the U.S.
The September 11 attacks, colloquially known as 9/11, were a coordinated series of suicide attacks perpetrated by the Islamic terrorist organization al-Qaeda
September_11_attacks
Cryptography primitive
function, collisions have been shown by Vincent Rijmen et al. in the paper Producing Collisions for PANAMA presented at FSE 2001. The attack shows a computational
Panama_(cryptography)
Message authentication code algorithm
is secure, this small additive term is insignificant for any practical attack. See specification for more details. Analysis of VMAC security has been
VMAC
Cryptographic hash function
One-way compression function Steinberger, John (June 23, 2007). "The Collision Intractability of MDC-2 in the Ideal-Cipher Model". Advances in Cryptology
MDC-2
1998 video game
falling over. Collision: Used only by particularly heavy attacks, collision rams the defending ATAC full force, always toppling it unless the attack is evaded
Vanguard_Bandits
Topics referred to by the same term
Shattered – Tale of the Forgotten King, a video game "SHAttered", a hash collision attack on SHA-1 algorithm Shattered set, a concept in mathematics, especially
Shattered
Key derivation function of password hash
addition, the algorithm incorporated a 12-bit salt in order to ensure that an attacker would be forced to crack each password independently as opposed to being
Crypt_(C)
Russian cryptographic hash function
section 11.2. In 2008, an attack was published that breaks the full-round GOST hash function. The paper presents a collision attack in 2105 time, and first
GOST_(hash_function)
Scheme that defines the format of magnet links
Kazaa hash Used on FastTrack, these hash sums are vulnerable to hash collision attacks. xt=urn:kzhash:[ Kazaa Hash (Hex) ] BitTorrent info hash (BTIH) These
Magnet_URI_scheme
Traffic collision type
A head-on collision is a traffic collision where the front ends of two vehicles such as cars, trains, ships or planes hit each other when travelling in
Head-on_collision
Dutch cryptographer (born 1981)
hash function. In February 2017, the first known successful SHA-1 collision attack in practice (termed "SHAttered") was recognized. Marc Stevens was first-credited
Marc_Stevens_(cryptology)
Cryptographic hash function
no collision attack or preimage attack against SANDstorm is known which is better than the trivial birthday attack or long second preimage attack. Torgerson
SANDstorm_hash
Memory-hard key derivation function
as a sub-algorithm (e.g., SHA-3, SHA-512), is resistant to side-channel attacks: the memory access pattern is independent of the data to be hashed, is
Balloon_hashing
Chinese computer scientist
she and co-authors demonstrated collision attacks against MD5, SHA-0 and other related hash functions (a collision occurs when two distinct messages
Wang_Xiaoyun
Cryptographic hash function
proposals, few hash functions based on modular arithmetic have withstood attack, and most that have tend to be relatively inefficient. MASH-1 evolved from
MASH-1
Short sequence of bytes used to authenticate or look up a longer public key
systems is a collision attack, where an attacker constructs multiple key pairs which hash to his own fingerprint. This may allow an attacker to repudiate
Public_key_fingerprint
Cryptographic attack
Correlation attacks are a class of cryptographic known-plaintext attacks for breaking stream ciphers whose keystreams are generated by combining the output
Correlation_attack
Authenticated encryption mode for block ciphers
the mode with messages longer than the key, but demonstrates a trivial attack against short messages using this mode. The authors stated that they did
EAX_mode
Czech cryptologist and computer security expert (born 1957)
exponentiation) could enable such a devastating attack? Not me. Klima, Vlastimil (5 March 2005). "Finding MD5 Collisions – a Toy For a Notebook". Cryptology ePrint
Vlastimil_Klíma
File format for storing file checksums
CRC-32 is not a collision resistant hash function; even if the hash sum file is not tampered with, it is computationally trivial for an attacker to cause deliberate
Simple_file_verification
Software that calculates and verifies SHA-1 hashes
cryptographic hash function. The SHA-1 variants are proven vulnerable to collision attacks, and users should instead use, for example, a SHA-2 variant such as
Sha1sum
Family of cryptographic hash functions
pre-image or collision resistance when the message space is chosen in a specific way. The following table shows the complexity of the best known attacks against
Fast_syndrome-based_hash
Probability of shared birthdays
a cryptographic attack called the birthday attack, which uses this probabilistic model to reduce the complexity of finding a collision for a hash function
Birthday_problem
practical collision attack 2004 – The first commercial quantum cryptography system becomes available from id Quantique. 2005 – Potential for attacks on SHA1
Timeline_of_cryptography
Cryptographic attack
to hash functions, leading to practical collision attacks against the hash. Known-key distinguishing attacks were first introduced in 2007 by Lars Knudsen
Known-key distinguishing attack
Known-key_distinguishing_attack
COLLISION ATTACK
COLLISION ATTACK
Boy/Male
Greek
One of the attackers against Thebes.
Surname or Lastname
English and Scottish
English and Scottish : variant of Collins.
Surname or Lastname
English
English : perhaps a nickname for a sarcastic, witty, or spiteful person, from early modern English squibbe ‘lampoon’, ‘satirical attack’. The word, which is probably of imitative origin, is not recorded until the 16th century; the original sense was ‘firework’.
Boy/Male
Arabic, Muslim
Attacker
Boy/Male
Norse
Leader of the attack on Hlidarend.
Surname or Lastname
English
English : variant of Collins.
Boy/Male
Greek
One of the Thebes attackers.
Surname or Lastname
English (chiefly Nottinghamshire)
English (chiefly Nottinghamshire) : variant of Hart.German : topographic name from Middle High German hurt ‘hurdle’, ‘woven fence’.Dutch : nickname, presumably for a pugnacious or aggressive person, from Middle Dutch hort, hurt ‘strike’, ‘blow’, ‘attack’.
Surname or Lastname
English
English : probably a variant of Collison.
Surname or Lastname
Irish
Irish : variant of Culliton.English : variant spelling of Colliton.
Girl/Female
Muslim
Attack
Boy/Male
Greek Latin
One of the attackers of Thehes.
Surname or Lastname
English
English : variant of Dollinson (see Dollins).
Girl/Female
Latin
To seek; to attack.
Boy/Male
Native American
attacking hawk.
Surname or Lastname
English
English : variant spelling of Rollison.
Boy/Male
Muslim
Attacker
Girl/Female
Indian
Attack
Boy/Male
Greek
Helps defend Thebes against the attackers.
Boy/Male
Greek
One of the attackers in 'The Seven Against Thebes'.
COLLISION ATTACK
COLLISION ATTACK
Boy/Male
Muslim
Servant of the most merciful
Female
Egyptian
, a daughter of Amenhotep IV.
Girl/Female
Muslim
Pretty, Beautiful
Girl/Female
Tamil
Tejashwini | தேஜஷà¯à®µà¯€à®¨à¯€Â
Lustrous or bright or radiant or intelligent, Brave, Powerful
Boy/Male
Gujarati, Hindu, Indian, Kannada, Telugu
Lord Vishnu
Boy/Male
Indian
The exalter
Male
Ukrainian
, apostle, messenger.
Girl/Female
Arabic, Indian, Muslim
Beautiful Garden Surrounded with Roses and Flowers
Boy/Male
English
World guardian.
Boy/Male
Bengali, Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Tamil, Telugu, Traditional
Victorious
COLLISION ATTACK
COLLISION ATTACK
COLLISION ATTACK
COLLISION ATTACK
COLLISION ATTACK
n.
A loud noise made by sudden collision; a bang.
n.
Violent striking together of two bodies; collision; crash.
n.
A violent collision or compression; a crash; destruction; ruin.
n.
A meeting; a clash; a collision.
adv. & a.
In collision; entangled.
v. i.
To partake of a collation.
v. t.
To strike in the stern, as by collision.
v. t.
The force of a blow; shock; collision.
v. t.
A light repast or luncheon; as, a cold collation; -- first applied to the refreshment on fast days that accompanied the reading of the collation in monasteries.
n.
The act of coalescing; union into a body or mass, as of separate bodies or parts; as, a coalition of atoms.
adv.
With direct and violentop position; with sudden collision.
a.
Acting in collusion.
a.
Characterized by collusion; done or planned in collusion.
n.
A loud noise resulting from collision; a noisy collision of bodies; a collision.
n.
The act of striking together; a striking together, as of two hard bodies; a violent meeting, as of railroad trains; a clashing.
n.
An entanglement; a collision, as in a boat race.
n.
See Collodion.
n.
A trick; collusion.
n.
A state of opposition; antagonism; interference.
n.
Clash or collision of heads in contest.