nist cryptography

Summary of research on hash table and hash functionWith the increasing of information level, the data has been replaced computing as the center of Information Computing, the demand for storage has been increasing the volume of explosive growth trend, storage has become an urgent need to improve the bottleneck. Hash table as an effective way to store mass information, this paper introduces the design of hash table, the conflict resolution scheme and the dynamic hash table in detail. In addition,

circuits, making the physical realization of the algorithm a quantum computer one of the most relaxed tasks.Quantum Fourier transform: 've seenThe core of the algorithm is the discovery order, which can reduce the problem of abelian subgroups, which can be solved by using the quantum Fourier transform. --nist Quantum WorldQuantum Fourier transform is the key to many quantum algorithms. It does not speed up the search for traditional Fourier transform

) in 1976 and subsequently widely circulated internationally. 3DES: Also known as Triple DES, is a generic term for the triple-Data encryption Algorithm (Tdea,triple-Encryption-algorithm) block cipher.It is equivalent to applying three DES encryption algorithms to each block of data. The encryption key length of the original des Cipher becomes easily brute force because of the enhancement of computer computing power; 3DES is designed to provide a relatively simple way to avoid similar attacks b

new symmetric advanced Data Encryption Standard AES based on the Rijndael algorithm replaces the data Encryption Standard DES. Asymmetric encryption because of the different encryption/decryption key (public key encryption, private key decryption), Key management is simple, also has been widely used. RSA is the most famous public-key cryptography algorithm for asymmetric encryption systems. AES algorithm AES basic principle and algorithm flowThe

detection and embedding) Graph Problems-Hard problems (clique, independent set, vertex cover, travelingSalesman Problem, Hamiltonian cycle, graph partition, vertex coloring,Edge coloring, graph isomorphism, Steiner Tree, feedback EDGE/vertex set Computational Geometry-Robust geometric primitives, convex hull, triangulationDiagrams, Nearest Neighbor Search, range search, point location,Intersection detection, bin packing, medial-Axis Transformation,Polygon partitioning, simplifying polygon

enough. MD5 (RFC 1321) is an improved version of Rivest in 1991 for MD4. It still groups the input in 512 bits, and its output is 128 bits. MD5 is more complex than MD4, and is slower to calculate, but more secure. MD5 is not safe enough. SHA1 (Secure Hash algorithm) is designed by the NIST NSA, whose output is a Hash value of 160 bits in length, so it is better for anti-poor lifting. The SHA-1 design is based on the same principles as MD4 and mimics

algorithm, MD5 and SHA-1 is the most widely used hash algorithm, and they are based on MD4 design. Introduction of commonly used hash algorithms:(1)MD4MD4 (RFC 1320) was designed by MIT's Ronald L. Rivest in 1990, and MD is the abbreviation for message Digest (Messages Digest). It is implemented with high-speed software on a 32-bit word processor-it is based on a bitwise operation of 32-bit operands.(2)MD5MD5 (RFC 1321) is an improved version of Rivest in 1991 for MD4. It still groups the input

Original address: http://www.cnblogs.com/jfzhu/p/4020928.html (a) symmetric encryption (symmetric cryptography)Symmetric encryption is the fastest and simplest way to encrypt encryption (encryption) and decryption (decryption) with the same key (secret key). Symmetric encryption has many algorithms, and because of its high efficiency, it is widely used in the core of many cryptographic protocols.Symmetric encryption typically uses a relatively small k

MD5 (Messages Digest algorithm 5): is a RSA data security company developed a one-way hashing algorithm. L SHA (Secure Hash algorithm): A 160-bit value can be generated for any length of data operation; SHA-1 in 1993, The Safe hashing algorithm (SHA) was presented by the National Institute of Standards and Technology (NIST) and served as a Federal Information Processing standard (FIPS PUB 180) was released and a revised version of FIPS pub 180-1, com

(i) Symmetric encryption (symmetric cryptography)Symmetric encryption is the fastest and simplest way to encrypt encryption (encryption) and decryption (decryption) with the same key (secret key). Symmetric encryption has many algorithms, and because of its high efficiency, it is widely used in the core of many cryptographic protocols.Symmetric encryption typically uses a relatively small key, typically less than the size of a bit. The greater the key

● Combined generators (combine the outputs of two or more rngs, eg, using)◆ The universal generatorsCombine 2 generators: lagged Fibonacci, xn + 1 = (Xn-k) mod 1677213◆ The kiss generator (Keep it simple, stupid)Combine three simple generators: congruential generator, 3-shift generator, multiply-with-Carry Generator● Blum-shub (BSS) generators, 1986● The havege Generator Pseudo-random sequence measurement criteria ● Fast, especially in simulation fast● Well distributed (pass all statistical t

RSA's Select ciphertext attack.RSA is vulnerable to the choice of ciphertext attacks. A general attacker would be to disguise a message (blind) and allow the entity with the private key to sign it. Then, after calculation, you get the information it wants. In fact, the attack exploits the same vulnerability, that is, the fact that the power of the power retains the multiplicative structure of the input:(XM) ^d = x^d *m^d mod nAs mentioned earlier, this inherent problem comes from the most useful

Advanced Encryption Standard (English: Advanced encryption Standard, abbreviation: AES), also known as the Rijndael encryption method in cryptography, is a block encryption standard used by the U.S. federal government. This standard, which replaces the original DES, has been analyzed and widely used worldwide. After five years of selection process, the Advanced Encryption Standard was issued by the National Institute of Standards and Technology (