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Adding data to a message prior to encryption to hide its length
In cryptography, padding is any of a number of distinct practices, all of which include adding data to the beginning, middle, or end of a message prior
Padding_(cryptography)
Cryptography attack
In cryptography, a padding oracle attack is an attack which uses the padding validation of a cryptographic message to decrypt the ciphertext. In cryptography
Padding_oracle_attack
Algorithm for public-key cryptography
cryptosystem) such as RSAES-OAEP, and public-key key encapsulation. In RSA-based cryptography, a user's private key—which can be used to sign messages, or decrypt
RSA_cryptosystem
Cryptographic algorithm
Symmetric-key algorithms are algorithms for cryptography that use the same cryptographic keys for both the encryption of plaintext and the decryption of
Symmetric-key_algorithm
Topics referred to by the same term
resilient to delay Padding argument, method of proving that some complexity classes are conditionally equal Padding (cryptography), increasing the length
Padding_(disambiguation)
Random data used as an additional input to a hash function
Password cracking Cryptographic nonce Initialization vector Padding "Spice" in the Hasty Pudding cipher Rainbow tables Pepper (cryptography) Fenton, James
Salt_(cryptography)
Process of converting plaintext to ciphertext
In cryptography, encryption (more specifically, encoding) is the process of transforming information in a way that, ideally, only authorized parties can
Encryption
Cryptography algorithm
inconvenient to add padding bytes. A number of modes of operation have been designed to combine secrecy and authentication in a single cryptographic primitive.
Block cipher mode of operation
Block_cipher_mode_of_operation
Method of building collision-resistant cryptographic hash functions
In cryptography, the Merkle–Damgård construction or Merkle–Damgård hash function is a method of building collision-resistant cryptographic hash functions
Merkle–Damgård_construction
Encryption technique
one-time pad (OTP) is an encryption technique that cannot be cracked in cryptography. It requires the use of a single-use pre-shared key that is larger than
One-time_pad
In cryptography, a padded uniform random blob or PURB is a discipline for encrypted data formats designed to minimize unintended information leakage either
PURB_(cryptography)
Cryptographic protocols for securing data in transit
Transport Layer Security (TLS) ClientHello Padding Extension," Proposed Standard. RFC 8422 – "Elliptic Curve Cryptography (ECC) Cipher Suites for Transport Layer
Transport_Layer_Security
Practice and study of secure communication techniques
Cryptography, or cryptology, is the practice and study of techniques for secure communication in the presence of adversarial behavior. More generally,
Cryptography
Input to a cryptographic primitive
attack, also called the BEAST attack. Cryptographic nonce Padding (cryptography) Random seed Salt (cryptography) Block cipher modes of operation CipherSaber
Initialization_vector
Type of cipher
(2008). "Immunising CBC Mode Against Padding Oracle Attacks: A Formal Security Treatment". Security and Cryptography for Networks. Lecture Notes in Computer
Block_cipher
Family of authenticated ciphers
by the U.S. National Institute of Standards and Technology (NIST) for cryptography on resource-constrained devices in 2025, specified in NIST SP 800-232
Ascon_(cipher)
Set of cryptographic hash functions
Padding the final data block must still occur prior to hash output. In July 2012, NIST revised SP800-57, which provides guidance for cryptographic key
SHA-2
Optimal asymmetric encryption padding • Over the Air Rekeying (OTAR) • OTFE • Otway–Rees protocol Padding (cryptography) • Padding oracle attack • Paillier
Index of cryptography articles
Index_of_cryptography_articles
Mathematical scheme for verifying the authenticity of digital documents
came from a known sender. Digital signatures are a type of public-key cryptography, and are commonly used for software distribution, financial transactions
Digital_signature
Computer communications authentication algorithm
In cryptography, an HMAC (sometimes expanded as either keyed-hash message authentication code or hash-based message authentication code) is a specific
HMAC
Secure network protocol suite
the cryptographic algorithm). The type of content that was protected is indicated by the Next Header field. Padding: 0-255 octets Optional. Padding for
IPsec
Cryptographic key management algorithm
In cryptography, the Double Ratchet Algorithm (previously referred to as the Axolotl Ratchet) is a key management algorithm that was developed by Trevor
Double_Ratchet_Algorithm
Scheme often used with RSA encryption
In cryptography, optimal asymmetric encryption padding (OAEP) is a padding scheme often used together with RSA encryption. OAEP was introduced by Bellare
Optimal asymmetric encryption padding
Optimal_asymmetric_encryption_padding
Early unclassified symmetric-key block cipher
modern applications, it has been highly influential in the advancement of cryptography. Developed in the early 1970s at IBM and based on an earlier design by
Data_Encryption_Standard
Property of some cryptographic algorithms
Malleability is a property of some cryptographic algorithms. An encryption algorithm is said to be malleable if it is possible to transform a ciphertext
Malleability_(cryptography)
Cipher design construction
In cryptography, an SP-network, or substitution–permutation network (SPN), is a series of linked mathematical operations used in block cipher algorithms
Substitution–permutation network
Substitution–permutation_network
Information used for message authentication and integrity checking
In cryptography, a message authentication code (MAC), sometimes known as an authentication tag, is a short piece of information used for authenticating
Message_authentication_code
Basic component of symmetric key algorithms
In cryptography, an S-box (substitution-box) is a basic component of symmetric key algorithms which performs substitution. In block ciphers, they are typically
S-box
Tables comparing general and technical information for common hashes
following tables compare general and technical information for a number of cryptographic hash functions. See the individual functions' articles for further information
Comparison of cryptographic hash functions
Comparison_of_cryptographic_hash_functions
Cryptographic hash function
In computer science and cryptography, Whirlpool (sometimes styled WHIRLPOOL) is a cryptographic hash function. It was designed by Vincent Rijmen (co-creator
Whirlpool_(hash_function)
Message-digest hashing algorithm
a cryptographic hash function; however it has been found to suffer from extensive vulnerabilities. It remains suitable for other non-cryptographic purposes
MD5
Concept in cryptography
In cryptography, the avalanche effect is the desirable property of cryptographic algorithms, typically block ciphers and cryptographic hash functions
Avalanche_effect
Cryptographic attack
flaws within the PKCS #1 v1.5 padding function to gradually reveal the content of an RSA encrypted message. Under this padding function, padded plaintexts
Adaptive chosen-ciphertext attack
Adaptive_chosen-ciphertext_attack
Implementations of Advanced Encryption Standard
plaintext blocks of 16 bytes. Encryption of shorter blocks is possible only by padding the source bytes, usually with null bytes. This can be accomplished via
AES_implementations
Technical standard
In cryptography, PKCS #1 is the first of a family of standards called Public-Key Cryptography Standards (PKCS), published by RSA Laboratories. It provides
PKCS_1
International standard
cipher block size, so that each subsequent cryptographic operation will have a complete block of data. Three padding methods are defined. In each case n is
ISO/IEC_9797-1
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
Cryptographic tool
proposed as part of the specification for padding in the RSA-OAEP algorithm. The OAEP algorithm required a cryptographic hash function that could generate an
Mask_generation_function
Unencrypted information
In cryptography, plaintext usually means unencrypted information pending input into cryptographic algorithms, usually encryption algorithms. This usually
Plaintext
Group of public-key cryptography standards
Public Key Cryptography Standards (PKCS) are a group of public-key cryptography intervendor standards first developed by RSA Security, with involvement
PKCS
Theory of cryptography
In cryptography, a sponge function or sponge construction is any of a class of algorithms with finite internal state that take an input bit stream of any
Sponge_function
Inventory of cryptographic assets used in software and systems
Cryptographic bill of materials (CBOM—also cryptography bill of materials) is a structured inventory of all cryptographic assets present in a software
Cryptographic bill of materials
Cryptographic_bill_of_materials
Class of cipher
In the history of cryptography, a grille cipher was a technique for encrypting a plaintext by writing it onto a sheet of paper through a pierced sheet
Grille_(cryptography)
Ability to easily switch cryptographic primitives
In cryptographic protocol design, cryptographic agility or crypto-agility is the ability to switch between multiple cryptographic primitives. A cryptographically
Cryptographic_agility
Form of message tampering
POODLE (which stands for "Padding Oracle On Downgraded Legacy Encryption") is a security vulnerability which takes advantage of the fallback behavior
POODLE
Chinese block cipher
商密4) (formerly SMS4) is a block cipher, standardised for commercial cryptography in China. It is used in the Chinese National Standard for Wireless LAN
SM4_(cipher)
Cryptography construction
construction is also used in cryptographic algorithms other than block ciphers. For example, the optimal asymmetric encryption padding (OAEP) scheme uses a simple
Feistel_cipher
Simple checksum formula
today. It is specified in ISO/IEC 7812-1. It is not intended to be a cryptographically secure hash function; it was designed to protect against accidental
Luhn_algorithm
Obsolete cryptographic hash function
The MD2 Message-Digest Algorithm is an obsolete cryptographic hash function developed by Ronald Rivest in 1989. The algorithm is optimized for 8-bit computers
MD2_(hash_function)
Set of cryptographic hash functions
MD5-like structure of SHA-1 and SHA-2. SHA-3 is a subset of the broader cryptographic primitive family Keccak (/ˈkɛtʃæk/ or /ˈkɛtʃɑːk/), designed by Guido
SHA-3
Attack model for cryptanalysis with access to both plaintext and ciphertext
which it may provide a means of solving. — The Bletchley Park 1944 Cryptographic Dictionary formatted by Tony Sale, 2001 (PDF), p. 22 The usage "crib"
Known-plaintext_attack
fingerprint Secret sharing Internet key exchange Strong cryptography Brute-force attack Dictionary attack Padding oracle attack Pass the hash Enigma machine Caesar
List of cybersecurity information technologies
List_of_cybersecurity_information_technologies
Set of cryptographic algorithms by the NSA
(CNSA) is a set of cryptographic algorithms promulgated by the National Security Agency as a replacement for NSA Suite B Cryptography algorithms. It serves
Commercial National Security Algorithm Suite
Commercial_National_Security_Algorithm_Suite
Encryption method
encryption function. Padding errors often result in the detectable errors on the recipient's side, which in turn lead to padding oracle attacks, such
Authenticated_encryption
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
Block cipher
In cryptography, Triple DES (3DES or TDES), officially the Triple Data Encryption Algorithm (TDEA or Triple DEA), is a symmetric-key block cipher, which
Triple_DES
Authenticated encryption mode for block ciphers
In cryptography, Galois/Counter Mode (GCM) is a mode of operation for symmetric-key cryptographic block ciphers. The proposal was first published in 2007
Galois/Counter_Mode
Attack against cryptographical hash functions
In cryptography and computer security, a length extension attack is a type of attack where an attacker can use Hash(message1) and the length of message1
Length_extension_attack
In cryptography, an all-or-nothing transform (AONT), also known as an all-or-nothing protocol, is an encryption mode which allows the data to be understood
All-or-nothing_transform
Type of symmetric key cipher
seed value using digital shift registers. The seed value serves as the cryptographic key for decrypting the ciphertext stream. Stream ciphers represent a
Stream_cipher
IEEE standardization project for public-key cryptography
standardization project for public-key cryptography. It includes specifications for: Traditional public-key cryptography (IEEE Std 1363-2000 and 1363a-2004)
IEEE_P1363
Security padding phrase used during the Battle of Leyte Gulf
1944. The words, intended to be without meaning, were added as security padding in an encrypted message to hinder Japanese attempts at cryptanalysis but
The_world_wonders
Cryptography method
In cryptography, a semantically secure cryptosystem is one where only negligible information about the plaintext can be feasibly extracted from the ciphertext
Semantic_security
Cryptographic algorithm
In cryptography, ciphertext stealing (CTS) is a general method of using a block cipher mode of operation that allows for processing of messages that are
Ciphertext_stealing
Block cipher
The project was specifically designed to resist future advances in cryptography by adopting a layered, compartmentalized approach. IBM's official report
MARS_(cipher)
Topics referred to by the same term
involuntarily expelled bodily fluids Shoulder pads (fashion), fabric-covered padding in clothing Cycling pad, found in cycling shorts, pants and tights Gamepad
Pad
Encryption tool used to perform a transposition cipher
In cryptography, a scytale (/ˈskɪtəliː/; /ˈskaɪteɪl/; also transliterated skytale, Ancient Greek: σκυτάλη skutálē "baton, cylinder", also σκύταλον skútalon)
Scytale
International standard
Counter (CTR) The standard notes that some modes require padding, but states that "Padding techniques ... are not within the scope of this International
ISO/IEC_10116
Error-detecting code for detecting data changes
use cryptographic authentication mechanisms, such as message authentication codes or digital signatures (which are commonly based on cryptographic hash
Cyclic_redundancy_check
C++ software library
libcrypto++, and libcryptopp) is a free and open-source C++ class library of cryptographic algorithms and schemes written by Wei Dai. Crypto++ has been widely
Crypto++
Standard for the encryption of electronic data
Agency (NSA) for top secret information when used in an NSA approved cryptographic module. The Advanced Encryption Standard (AES) is defined in these standards:
Advanced_Encryption_Standard
Form of digital signature
scheme the signer would typically use a padding scheme (e.g. by instead signing the result of a cryptographic hash function applied to the message, instead
Blind_signature
Cryptographic hardware
In cryptography, the EFF DES cracker (nicknamed "Deep Crack") is a machine built by the Electronic Frontier Foundation (EFF) in 1998, to perform a brute
EFF_DES_cracker
0 (1996) and TLS 1.0 (1999) are successors with two weaknesses in CBC-padding that were explained in 2001 by Serge Vaudenay. TLS 1.1 (2006) fixed only
Comparison of TLS implementations
Comparison_of_TLS_implementations
Class of cryptographic attacks
Coppersmith's attack describes a class of cryptographic attacks on the public-key cryptosystem RSA based on the Coppersmith method. Particular applications
Coppersmith's_attack
Block cipher
standards. ISO/IEC 29192-2:2019, Information security - Lightweight cryptography - Part 2: Block ciphers RFC 6114 Tezcan, Cihangir. "The Improbable Differential
CLEFIA
Public-key cryptosystem
In cryptography, the ElGamal encryption system is a public-key encryption algorithm based on the Diffie–Hellman key exchange. It was described by Taher
ElGamal_encryption
Block cipher
Mode of operation Padding v t e Cryptography General History of cryptography Outline of cryptography Classical cipher Cryptographic protocol Authentication
Threefish
Type of cryptographic attack
In cryptography, the Davies attack is a dedicated statistical cryptanalysis method for attacking the Data Encryption Standard (DES). The attack was originally
Davies_attack
(September 1984). "Correlation-Immunity of Nonlinear Combining Functions for Cryptographic Applications". IEEE Transactions on Information Theory. 30 (5): 776–780
Correlation_immunity
Process of developing the AES standard
Data Encryption Standard (DES). This process won praise from the open cryptographic community, and helped to increase confidence in the security of the
Advanced Encryption Standard process
Advanced_Encryption_Standard_process
Disk encryption software
LUKS1 such as Argon2. LUKS2 uses JSON as a metadata format. Available cryptographic algorithms depend on individual kernel support of the host. Libgcrypt
Linux_Unified_Key_Setup
Block cipher
In cryptography, FEAL (the Fast data Encipherment Algorithm) is a block cipher proposed as an alternative to the Data Encryption Standard (DES), and designed
FEAL
Cryptographic software library
Libgcrypt is a cryptography library developed as a separated module of GnuPG. It can also be used independently of GnuPG, but depends on its error-reporting
Libgcrypt
Block cipher
In cryptography, Skipjack is a block cipher — an algorithm for encryption — developed by the United States National Security Agency (NSA). Initially a
Skipjack_(cipher)
Japanese cryptography research project
CRYPTREC is the Cryptography Research and Evaluation Committees set up by the Japanese Government to evaluate and recommend cryptographic techniques for
CRYPTREC
Public-key authentication standard
the context of WebAuthn, but since there are more secure cryptographic primitives and padding schemes, it is still a bad choice and cryptographers no longer
WebAuthn
Cryptographic hash function
BLAKE is a cryptographic hash function based on Daniel J. Bernstein's ChaCha stream cipher, but a permuted copy of the input block, XORed with round constants
BLAKE_(hash_function)
Hiding messages in other messages
Steganographia, a treatise on cryptography and steganography, disguised as a book on magic. The advantage of steganography over cryptography alone is that the intended
Steganography
Cryptographic model of a random function
In cryptography, a random oracle is an oracle (a theoretical black box) that responds to every unique query with a (truly) random response chosen uniformly
Random_oracle
Smart card
secure element is not limited to its smart cards and other removable cryptographic tokens form factors; embedded SEs soldered onto a device board and new
Java_Card
Unsolved problem in cryptography
In cryptography, the RSA problem summarizes the task of performing an RSA private-key operation given only the public key. The RSA algorithm raises a message
RSA_problem
Length of bit string processed by a cipher
In modern cryptography, symmetric key ciphers are generally divided into stream ciphers and block ciphers. Block ciphers operate on a fixed length string
Block_size_(cryptography)
Block cipher
In cryptography, the Tiny Encryption Algorithm (TEA) is a block cipher notable for its simplicity of description and implementation, typically a few lines
Tiny_Encryption_Algorithm
Method of bit-shuffling used to diffuse bits across S-box inputs
In cryptography, a permutation box (or P-box) is a method of bit-shuffling used to permute or transpose bits across S-boxes inputs, creating diffusion
Permutation_box
Form of cryptanalaysis
In cryptography, truncated differential cryptanalysis is a generalization of differential cryptanalysis, an attack against block ciphers. Lars Knudsen
Truncated differential cryptanalysis
Truncated_differential_cryptanalysis
Use of randomness in key code generation
optimal asymmetric encryption padding (OAEP). Probabilistic encryption is particularly important when using public key cryptography. Suppose that the adversary
Probabilistic_encryption
Public-key cryptosystem
Encryption Padding Hybrid cryptosystem Galbraith, Steven (2012). "§23.1.1: The KEM/DEM paradigm". Mathematics of Public-Key Cryptography. Cambridge University
Key_encapsulation_mechanism
Block cipher
In cryptography, CRYPTON is a symmetric block cipher submitted as a candidate for the Advanced Encryption Standard (AES). It is very efficient in hardware
CRYPTON
Block cipher
In cryptography, Twofish is a symmetric key block cipher with a block size of 128 bits and key sizes up to 256 bits. It was one of the five finalists of
Twofish
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