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Attack model for cryptanalysis with access to both plaintext and ciphertext
The known-plaintext attack (KPA) is an attack model for cryptanalysis where the attacker has access to both the plaintext (called a crib) and its encrypted
Known-plaintext_attack
Attack model for cryptanalysis with presumed access to ciphertexts for chosen plaintexts
chosen-plaintext attack (CPA) is an attack model for cryptanalysis which presumes that the attacker can obtain the ciphertexts for arbitrary plaintexts. The
Chosen-plaintext_attack
Encryption algorithm used by DVB television standard
recalculated. This allows for possible known-plaintext attacks when combined with knowledge of the underlying plaintext structure. As the first three bytes
Common_Scrambling_Algorithm
Classification of cryptographic attack
In a cryptographic attack a third party cryptanalyst analyzes the ciphertext to try to "break" the cipher, to read the plaintext and obtain the key so
Attack_model
Generic space–time tradeoff cryptographic attack
The meet-in-the-middle attack (MITM), a known-plaintext attack, is a generic space–time tradeoff cryptographic attack against encryption schemes that rely
Meet-in-the-middle_attack
Type of cryptographic attack
known-plaintext attack based on the non-uniform distribution of the outputs of pairs of adjacent S-boxes. It works by collecting many known plaintext/ciphertext
Davies_attack
Stream cipher
minutes or seconds. Originally, the weaknesses were passive attacks using the known plaintext assumption. In 2003, more serious weaknesses were identified
A5/1
Block cipher
describes an attack requiring 100–10000 chosen plaintexts, and Sean Murphy (1990) found an improvement that needs only 20 chosen plaintexts. Murphy and
FEAL
Unencrypted information
becoming "plaintext" input for the next. Insecure handling of plaintext can introduce weaknesses into a cryptosystem by letting an attacker bypass the
Plaintext
Form of cryptanalysis
vulnerable to a known-plaintext attack. The slide attack is closely related to the related-key attack. The idea of the slide attack has roots in a paper
Slide_attack
Process of intercepting and examining messages
especially when the attempted crack depends on successfully seeding a known-plaintext attack, which often requires an inspired guess based on how specific the
Traffic_analysis
Cryptography attack
variable-length plaintext messages often have to be padded (expanded) to be compatible with the underlying cryptographic primitive. The attack relies on having
Padding_oracle_attack
Block cipher
plaintexts that give equal intermediate values in the encryption process. He presented both a chosen-plaintext attack and a known-plaintext attack; each
Ladder-DES
Block cipher
Unfortunately, this approach is vulnerable to the meet-in-the-middle attack: given a known plaintext pair ( x , y ) {\displaystyle (x,y)} , such that y = E K 2
Triple_DES
Encryption algorithm
XOR operator in any of these ciphers is vulnerable to a known-plaintext attack, since plaintext ⊕ {\displaystyle \oplus } ciphertext = key. It is also
XOR_cipher
Type of symmetric key cipher
key cipher where plaintext digits are combined with a pseudorandom cipher digit stream (keystream). In a stream cipher, each plaintext digit is encrypted
Stream_cipher
System to replace plaintext with ciphertext
encrypting that creates the ciphertext (its output) by replacing units of the plaintext (its input) in a defined manner, with the help of a key; the "units" may
Substitution_cipher
Attack model in cryptanalysis
While the attacker has no channel providing access to the plaintext prior to encryption, in all practical ciphertext-only attacks, the attacker still has
Ciphertext-only_attack
Attack model against cryptographic hash functions
store password validation data for authentication. Rather than store the plaintext of user passwords, an access control system stores a hash of the password
Preimage_attack
Form of message tampering
Meddler-in-the-Middle (MitM) attacker removes the STARTTLS capability from the server response, they can easily downgrade the connection to plaintext. "Manipulator-in-the-middle
Man-in-the-middle_attack
Block cipher
dialled digit), there is a known-plaintext attack using 40 to 80 known plaintexts. For 2-byte blocks, 4 known plaintexts suffice. The "improved" CMEA
Cellular Message Encryption Algorithm
Cellular_Message_Encryption_Algorithm
Attempting to break a system solely based upon ciphertext
can also include known plaintext attacks where both the plaintext and its corresponding ciphertext are known. While active attackers can interact with
Passive_attack
Practice and study of secure communication techniques
replacement of a unit of plaintext (i.e., a meaningful word or phrase) with a code word (for example, "wallaby" replaces "attack at dawn"). A cypher, in
Cryptography
Security padding phrase used during the Battle of Leyte Gulf
"Sincerely". Today, this kind of vulnerability is referred to as a known-plaintext attack. At Bletchley Park, the Allies' codebreakers referred to these predictable
The_world_wonders
Malicious software used in ransom demands
and encrypted copies (a known-plaintext attack in the jargon of cryptanalysis; this attack only works when the cipher the attacker used was weak to begin
Ransomware
Topics referred to by the same term
high temperature in a kiln Kilopascal (kPa), a unit of pressure Known-plaintext attack, a method of cryptanalysis Korean People's Army, the armed forces
KPA
Early unclassified symmetric-key block cipher
self-published. van Oorschot, Paul C.; Wiener, Michael J. (1991), "A Known-Plaintext Attack on Two-Key Triple Encryption", in Damgård, Ivan Bjerre (ed.), Advances
Data_Encryption_Standard
Type of cipher
plaintext. Chosen-plaintext (chosen-ciphertext): the attacker can obtain the ciphertexts (plaintexts) corresponding to an arbitrary set of plaintexts
Block_cipher
Ciphers used by the Imperial Japanese Navy in World War II
messages, such as "I have the honor to inform your excellency" (see known plaintext attack). New versions of JN-25 were introduced: JN-25c from 28 May 1942
Japanese_naval_codes
Form of cryptanalysis
1993; 1994). The attack on DES is not generally practical, requiring 247 known plaintexts. A variety of refinements to the attack have been suggested
Linear_cryptanalysis
Late 19th-century machine for summarizing information stored on punch cards
British at Hut 8 used Hollerith machinery to gain some knowledge of Known-plaintext attack cribs used by encrypted German messages. IBM 402 and 403, from 1948
Tabulating_machine
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
Method of encryption
example, the plaintext "THIS IS WIKIPEDIA" could be encrypted to "TWDIP SIHII IKASE". To decipher the encrypted message without the key, an attacker could try
Transposition_cipher
Codebreaking device created at Bletchley Park (United Kingdom)
present at a defined point in the message. This technique is termed a known plaintext attack and had been used to a limited extent by the Poles, e.g., the Germans'
Bombe
Attacks against common ciphers
time complexity, number of cipher evaluations for the attacker "data" — required known plaintext-ciphertext pairs (if applicable) "memory" — how many blocks
Cipher_security_summary
Suite of Microsoft security protocols
hashcat and sufficient GPU power the NTLM hash can be derived using a known plaintext attack by cracking the DES keys with hashcat mode 14000 as demonstrated
NTLM
Block cipher
block size. A reduced-round variant of Blowfish is known to be susceptible to known-plaintext attacks on reflectively weak keys. Blowfish implementations
Blowfish_(cipher)
Cipher design construction
manner. If an attacker somehow obtains one plaintext corresponding to one ciphertext – a known-plaintext attack, or worse, a chosen plaintext or chosen-ciphertext
Substitution–permutation network
Substitution–permutation_network
Concept in cryptography
space and, in some situations, with a comparison test value (see known plaintext attack). Output consists of a signal that the IC has found an answer and
Custom_hardware_attack
Encrypted information
the result of encryption performed on plaintext using an algorithm, called a cipher. Ciphertext is also known as encrypted or encoded information because
Ciphertext
English engineer (1905–1998)
could run four tapes and was used for running depths and "cribs" or known-plaintext attack runs. Flowers gained full backing for his project from the director
Tommy_Flowers
Cryptographic attack
such an attack against 7 out of 10 rounds of the AES cipher and another attack against a generalized Feistel cipher. Their attack finds plaintext/ciphertext
Known-key distinguishing attack
Known-key_distinguishing_attack
Cryptographic attack
preimage attack where a specific target hash value is specified. There are roughly two types of collision attacks: Classical collision attack Find two
Collision_attack
Type of in security engineering
is then encrypted. This can be used in protocol attacks to detect when the injected known plaintext is even partially similar to the unknown content
Oracle_attack
Algorithm
Symmetric ciphers have historically been susceptible to known-plaintext attacks, chosen-plaintext attacks, differential cryptanalysis and linear cryptanalysis
Symmetric-key_algorithm
Public-key cryptosystem
against even known-plaintext attack—an adversary can tell whether the sender is sending the message ATTACK AT DAWN versus the message ATTACK AT DUSK simply
Key_encapsulation_mechanism
Cryptography algorithm
an attacker knows the IV (or the previous block of ciphertext) before the next plaintext is specified, they can check their guess about plaintext of some
Block cipher mode of operation
Block_cipher_mode_of_operation
Simple type of polyalphabetic encryption system
For example, if the plaintext is attacking tonight and the key is oculorhinolaryngology, then the first letter of the plaintext, a, is shifted by 14
Vigenère_cipher
Process of encrypting message one or more times
attack also vulnerable to a known plaintext attack. However, a block cipher must not be vulnerable to a chosen plaintext attack to be considered secure.
Multiple_encryption
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
Study of analyzing information systems in order to discover their hidden aspects
or codetexts. Known-plaintext: the attacker has a set of ciphertexts to which they know the corresponding plaintext. Chosen-plaintext (chosen-ciphertext):
Cryptanalysis
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
Theoretical attack on block ciphers
these equations and recover the key. The attack is notable for requiring only a handful of known plaintexts to perform; previous methods of cryptanalysis
XSL_attack
Substitution cipher based on linear algebra
vulnerable to a known-plaintext attack because it is completely linear. An opponent who intercepts n 2 {\displaystyle n^{2}} plaintext/ciphertext character
Hill_cipher
port 587 was assigned as the SMTP submission port, but was initially in plaintext, with encryption eventually provided years later by the STARTTLS extension
List of TCP and UDP port numbers
List_of_TCP_and_UDP_port_numbers
Cryptographic attack
content of an RSA encrypted message. Under this padding function, padded plaintexts have a fixed format that it should follow. If the decryption device (e
Adaptive chosen-ciphertext attack
Adaptive_chosen-ciphertext_attack
US cryptographic equipment
capturing the systems, was exploiting its vulnerability to the known-plaintext attack (e. g., when the same text was published in press releases), as
M-94_(cipher_machine)
Cryptographic protocols for securing data in transit
transmission speeds for users. This is a known limitation of TLS as it is susceptible to chosen-plaintext attack against the application-layer data it was
Transport_Layer_Security
Family of block ciphers
000 was offered for the best attack on one round of REDOC-II, and $20,000 for the best practical known-plaintext attack. REDOC III is a more efficient
REDOC
plaintext-aware is actually secure against a chosen-ciphertext attack, since any adversary that chooses ciphertexts would already know the plaintexts
Plaintext-aware_encryption
Standard for the encryption of electronic data
cache-timing attack that he used to break a custom server that used OpenSSL's AES encryption. The attack required over 200 million chosen plaintexts. The custom
Advanced_Encryption_Standard
English codebreaker (1921–2013)
and was thus easier to solve. The methods included 'rodding' and known-plaintext attack (which was called 'cribbing' at Bletchley Park). Knox wanted to
Mavis_Batey
Cryptographic number generator
(2023-03-17). "Tests for Random Number Generators". Marina Pudovkina, A known plaintext attack on the ISAAC keystream generator, 2001, Cryptology ePrint Archive:
ISAAC_(cipher)
Family of archive file formats
bbsdocumentary.com. Retrieved 25 September 2020. Stay, Michael. "ZIP Attacks with Reduced Known Plaintext" (PDF). Math.ucr.edu. Archived from the original (PDF) on
ZIP_(file_format)
Rotor encryption machine
of supporting large networks that was considered secure against known plaintext attack. Some 25,000 machines were in use in the mid-1960s. From 1956 on
KL-7
Property of some cryptosystems
message they encrypt. The property of indistinguishability under chosen plaintext attack is considered a basic requirement for most provably secure public key
Ciphertext indistinguishability
Ciphertext_indistinguishability
British codebreaking device of WW2
running four tapes and was used for running depths and "cribs" or known-plaintext attack runs. "Robinson - The National Museum of Computing". www.tnmoc.org
Heath Robinson (codebreaking machine)
Heath_Robinson_(codebreaking_machine)
1950s cipher machines by Crypto AG
Greenough, Cryptanalysis of the Hagelin C-52 and similar machines a known plaintext attack, Cryptologia, 23(2), July 1999, pp139–156. Louis Kruh, The Hagelin
C-52_(cipher_machine)
Input to a cryptographic primitive
and is able to forward plaintext messages to Alice for encryption (in other words, Eve is capable of a chosen-plaintext attack). Now assume that Alice
Initialization_vector
Crypyographic attack method
weakness in the KSA. Because the first byte of the plaintext comes from the WEP SNAP header, an attacker can assume they can derive the first byte of the
Fluhrer, Mantin and Shamir attack
Fluhrer,_Mantin_and_Shamir_attack
Class of cryptographic attacks
is small and the plaintext m {\displaystyle m} is very short, then the RSA function may be easy to invert, which makes certain attacks possible. Padding
Coppersmith's_attack
Encryption method
Encryption Input: plaintext, key, and optionally a header (also known as additional authenticated data, AAD, or associated data, AD) in plaintext that will not
Authenticated_encryption
Method of discovering password length
application data payloads is directly known to the attacker and this inadvertently reveals information about the plaintext size; similar to how a draped or
Bicycle_attack
Type of cryptanalytic attack
part varies through all possibilities. For example, an attack might use 256 chosen plaintexts that have all but 8 of their bits the same, but all differ
Integral_cryptanalysis
Any attack based on information gained from the implementation of a computer system
based on leaked electromagnetic radiation, which can directly provide plaintexts and other information. Such measurements can be used to infer cryptographic
Side-channel_attack
Schemes to entice the Germans to include known plaintext during World War II
cryptanalysis, gardening is the act of encouraging a target to use known plaintext in an encrypted message, typically by performing some action the target
Gardening_(cryptanalysis)
Type of data encryption
decrypted with an incorrect key as guessed by the attacker, presents a plausible-looking yet incorrect plaintext." Ari Juels and Thomas Ristenpart of the University
Honey_encryption
British engineer
present at a defined point in the message. This technique is termed a known plaintext attack and had been used to a limited extent by the Poles, e.g., the Germans'
Harold_Keen
Disused cipher that was used historically
attacks than ciphertext-only attacks. A good modern cipher must be secure against a wide range of potential attacks including known-plaintext attacks
Classical_cipher
Cryptographic attack
In cryptography, a timing attack is a side-channel attack in which the attacker attempts to compromise a cryptosystem by analyzing the time taken to execute
Timing_attack
Simple and widely known encryption technique
most widely known encryption techniques used in cryptography. It is a type of substitution cipher in which each letter in the plaintext is replaced by
Caesar_cipher
General form of cryptanalysis applicable primarily to block ciphers
extensions that would allow a known plaintext or even a ciphertext-only attack. The basic method uses pairs of plaintexts related by a constant difference
Differential_cryptanalysis
Key that is easy to break with a specific cipher
above. RC4. RC4's weak initialization vectors allow an attacker to mount a known-plaintext attack and have been widely used to compromise the security of
Weak_key
Adding data to a message prior to encryption to hide its length
known plaintext that aids in breaking the encryption. Random length padding also prevents an attacker from knowing the exact length of the plaintext message
Padding_(cryptography)
Attack model for cryptanalysis
semantically secure under chosen-plaintext attack, but this semantic security can be trivially defeated under a chosen-ciphertext attack. Early versions of RSA
Chosen-ciphertext_attack
Stream cipher
clearly the fastest and only practical known-plaintext attack on Bluetooth encryption compare with all existing attacks". A5/1 RC4 Hermelin, Miia; Kaisa Nyberg
E0_(cipher)
American computer professional (born 1966)
(1993-1996), ISAAC and RC4. Accessed on 2009-05-29. Marina Pudovkina, A known plaintext attack on the ISAAC keystream generator Bob Jenkins (1997), Hash functions
Robert_John_Jenkins_Jr.
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
Methods to break a stream cipher
Stream ciphers, where plaintext bits are combined with a cipher bit stream by an exclusive-or operation (xor), can be secure if used properly.[citation
Stream_cipher_attacks
Process of converting plaintext to ciphertext
converts the original representation of the information, known as plaintext, into an alternative form known as ciphertext. Despite its goal, encryption does not
Encryption
German cryptography expert and hacker (born 1981)
minutes and crack the internal key, thus performing a Known Plaintext Attack. This allows an attacker to send a signed SMS, which in turn loads a Java app
Karsten_Nohl
Encryption technique
simply yields all plaintexts, all equally likely to be the actual plaintext. Even with a partially known plaintext, brute-force attacks cannot be used,
One-time_pad
Form of cryptanalysis
for E1−1 (the decryption action of E1). The basic attack proceeds as follows: Choose a random plaintext P {\displaystyle P} and calculate P ′ = P ⊕ Δ {\displaystyle
Boomerang_attack
Cryptanalytic attacks using a system of multivariate equations
into plaintext. It has been used for vulnerability testing for encryption algorithms as well as hacking systems for malicious intent. Algebraic attacks can
Algebraic_attack
Cryptographic network protocol
(rsh) and the related rlogin and rexec protocols, which all use insecure, plaintext methods of authentication, such as passwords. Since mechanisms like Telnet
Secure_Shell
Algorithm for public-key cryptography
attacker can successfully launch a chosen plaintext attack against the cryptosystem, by encrypting likely plaintexts under the public key and test whether
RSA_cryptosystem
Study of the frequency of letters or groups of letters in a ciphertext
natural language plaintext are preserved in the ciphertext, and these patterns have the potential to be exploited in a ciphertext-only attack. In a simple
Frequency_analysis
Stream cipher
of K[0], K[1], ... which are XORed with the plaintext to obtain the ciphertext. So ciphertext[l] = plaintext[l] ⊕ K[l]. Several operating systems include
RC4
Block cipher
linear attacks, currently best attack on DES-X is a known-plaintext slide attack discovered by Biryukov-Wagner which has complexity of 232.5 known plaintexts
DES-X
Key derivation function of password hash
because DES was resistant to key recovery even in the face of "known plaintext" attacks, and because it was computationally expensive. On the earliest
Crypt_(C)
KNOWN PLAINTEXT-ATTACK
KNOWN PLAINTEXT-ATTACK
Boy/Male
Hindu
Known
Girl/Female
Hindu
Knowledge, Known, **
Girl/Female
Tamil
Knowledge, Known, **
Boy/Male
Arabic, Muslim
Known
Boy/Male
Muslim
Known. Celebrated.
Boy/Male
Indian
Known, Accepted
Boy/Male
Tamil
Known lecturer
Boy/Male
Indian
Well-known
Boy/Male
Indian
Known, Accepted
Girl/Female
Biblical
Known.
Boy/Male
Muslim
Known, Accepted
Boy/Male
Tamil
World known
Boy/Male
Muslim
Well-known
Boy/Male
Hindu
Known lecturer
Girl/Female
Tamil
Well known
Boy/Male
Hindu
World known
Boy/Male
Tamil
Known
Girl/Female
Tamil
Pratitha | பà¯à®°à®¤à®¿à®¤à®¾
Well known
Pratitha | பà¯à®°à®¤à®¿à®¤à®¾
Boy/Male
Muslim
Known, Accepted
Boy/Male
Muslim
Known. Celebrated.
KNOWN PLAINTEXT-ATTACK
KNOWN PLAINTEXT-ATTACK
Boy/Male
English
From the red pool.
Boy/Male
Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi
Son of Dhritrashtra
Girl/Female
Hindu
Girl/Female
Indian
Goddess of the sky.
Female
Egyptian
, granddaughter of king Tetet.
Girl/Female
Indian
More than Sky
Surname or Lastname
English (Devon)
English (Devon) : variant spelling of Luscombe.
Surname or Lastname
English
English : probably a variant of Mellor. Compare Mealor, Meeler.
Boy/Male
Australian, French, Greek, Latin, Portuguese, Spanish
Christian; Follower of Christ
Girl/Female
Tamil
Dust colored, White
KNOWN PLAINTEXT-ATTACK
KNOWN PLAINTEXT-ATTACK
KNOWN PLAINTEXT-ATTACK
KNOWN PLAINTEXT-ATTACK
KNOWN PLAINTEXT-ATTACK
a.
Publicly known; conspicuous.
a.
Not known; unknown.
n.
One who knows everything; hence, one who makes pretension to great knowledge; a wiseacre; -- usually ironical.
n.
Rarely known; unusual; strange.
n.
One who is curious to know everything that passes; one who knows, or pretends to know, all that is going on.
a.
Fully known; generally known or acknowledged.
v. i.
To perceive or apprehend clearly and certainly; to understand; to have full information of; as, to know one's duty.
v. i.
To be acquainted with; to be no stranger to; to be more or less familiar with the person, character, etc., of; to possess experience of; as, to know an author; to know the rules of an organization.
v. i.
To be convinced of the truth of; to be fully assured of; as, to know things from information.
a.
Without a known author.
a.
Not known; not apprehended.
n.
The doctrines, principles, or practices, of the Know-nothings.
p. p.
of Know.
a.
Not known; unknown.
a.
Famous; renowned; well known.
v. i.
To recognize; to distinguish; to discern the character of; as, to know a person's face or figure.
p. p.
of Know
a.
Well-known; notorious.