#hash function

[orbitbrain]

NIST to Retire 27-Year-Old SHA-1 Cryptographic Algorithm

NIST to Retire 27-Year-Old SHA-1 Cryptographic Algorithm

Home › Data Protection NIST to Retire 27-Year-Old SHA-1 Cryptographic Algorithm By Ionut Arghire on December 16, 2022 Tweet The US National Institute of Standards and Technology (NIST) this week recommended that IT professionals replace the SHA-1 cryptographic algorithm with newer, more secure ones. The first widely used method of securing electronic information and in use since 1995, SHA-1 is a…

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[techiio]

Complete review of Hash function :Types of Hash function

We will learn about Hash functions in this blog post. We will see all of its types and a brief description of each type. We will also learn about Hash collision in this blog post.

The hash function is a function that uses the constant-time operation to store and retrieve the value from the hash table, which is applied on the keys as integers and this is used as the address for values in the hash table. In a hash table, a new index is processed using the keys. And, the element corresponding to that key is stored in the index. This process is called the hashing(hash function).

[digitalnotice]

Hashing: A Guide For Beginners

Hashing: A Guide For Beginners

Hashing refers to generate a value or values from a string of text by using a mathematical function, and it is a one way to enable security during the process of message transmission when the message is intended for a particular recipient only, as a formula generates the hash, which helps to protect the security of the transmission against tampering.

Hashing is used to index and retrieve items…

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[ijtsrd]

An Efficient Reconstructing Routing Path in Dynamic and Large scale networks using Extensive hashing

by A. Satish Kumar | P. Hari Priya | V. Navya | V. N. Anshitha | MD. Shabeena" An Efficient Reconstructing Routing Path in Dynamic and Large scale networks using Extensive hashing" 

Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-3 , April 2018, 

URL: http://www.ijtsrd.com/papers/ijtsrd11230.pdf  

Direct URL: http://www.ijtsrd.com/computer-science/computer-network/11230/an-efficient-reconstructing-routing-path-in-dynamic-and-large-scale-networks-using-extensive-hashing/a-satish-kumar

indexed journal, ugc journal list, submit paper online

Now-a-days, wireless sensor networks (WSNs) are getting progressively advanced with the developing system scale and the dynamic idea of remote correspondences. Numerous estimation and demonstrative methodologies rely upon per-parcel steering ways for exact and fine-grained examination of the mind boggling net-work practices. In this paper, we propose iPath, a novel way surmising way to deal with recreating the per-bundle steering ways in powerful and expansive scale systems. The fundamental thought of iPath is to misuse high way closeness to iteratively gather long ways from short ones. IPath begins with an underlying known arrangement of ways and performs way deduction iteratively. iPath incorporates a novel outline of a lightweight Extensible hashing, hash work for confirmation of the surmised ways. So as to additionally enhance the deduction ability and additionally the execution proficiency, iPath incorporates a quick bootstrapping calculation to remake the underlying arrangement of ways. We additionally execute iPath and assess its execution utilizing follows from huge scale WSN organizations and in addition broad reproductions. Results demonstrate that iPath accomplishes significantly higher remaking proportions under various system settings contrasted with other best in class approaches. 

[contfeed-blog]

Hash Function attacks

Blockchain technology is one of the most innovative discoveries in recent years. One of its core principles is the hash function. What is Hashing? Hashing is, simply put, taking an input string of any length and giving out an output of a fixed length. Cryptographic hashing refers a special class...

#Hash_Function, #What_Is_Hash_Function, #Cryptographic_Hash_Function, #Hash_Function_In_Data_Structure, #Hash_Functions #Blockchain, #Records_Keeping

Check Full Story here >> RecordsKeeper

[dragallur]

Cryptography and passwords

Hi, today I will write about passwords and their security. Mostly I want to explain what “hashing” means in this context. Its certainly important issue considering that for example last year in May there were 164 million passwords from LinkedIn offered for sale.

Good site that user needs to log in wont safe your password. You should be the only person who knows it. How can they check when you…

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[bk2204]

Performance of SHA-256 and SHA-512

The popular hash function to use these days for security is SHA-256, and for good reason: it's fast, secure, well-supported, and has a reasonable length. But what if I told you there were a better alternative for the first three.

Turns out, there is: SHA-512.

“But wait,” you're probably asking me, “how is SHA-512 better than SHA-256?” Well, it's not only secure and well-supported, on most messages exceeding 55 bytes (which is almost all the data you care about), SHA-512 is faster than SHA-256.

That's right, faster.

The reason is that on 64-bit systems, SHA-512 hashes twice as much data as SHA-256 (128 bytes per block instead of 64), but performs only 25% more work (80n 64-bit operations instead of 64n 32-bit operations). Now, granted, the processor will have to do a bit more work loading all the data from memory, but for most messages, it's a bunch faster.

Furthermore, everything I said here about SHA-512 applies to SHA-384, and the same goes for SHA-256 and SHA-224. In fact, this is the reason that NIST created SHA-512/t, so you could get the performance of SHA-512 on 64-bit systems when you need a 256-bit output size.

So why would you still want to use SHA-256? Well, if you want better performance on 32-bit systems, or if you need output that is shorter for human reasons (because, say, you want it to fit on an 80-column terminal or humans are going to have to manually read it), then you might want SHA-256. Also, if you're using a 256-bit elliptic curve or some other place with a fixed 256-bit size (or where size is a concern), it only makes sense to use SHA-256.

Overall, though, if you're doing things like setting up SSH parameters or signing data with GnuPG and an RSA key, you might as well use SHA-512.

[kr-studios]

Here’s a thing. The first function took me forever to find again, so I’m putting it here and tagging it.

#include <cstdint> #include <iostream> //http://stackoverflow.com/questions/664014/what-integer-hash-function-are-good-that-accepts-an-integer-hash-key //hash a single 32-bit integer unsigned uinthash(unsigned x) { x = ((x >> 16) ^ x) * 0x45d9f3b; x = ((x >> 16) ^ x) * 0x45d9f3b; x = ((x >> 16) ^ x); return x; } //hash a byte array into a 32-bit integer unsigned fnv_hash_1a_32(void *key, int len) { unsigned char *p = static_cast<unsigned char*>(key); unsigned h = 0x811c9dc5; for (int i = 0; i < len; i++) { h = ( h ^ p[i] ) * 0x01000193; } return h; } //2D coordinates, and a world seed uint32_t coordhash(uint32_t seed, uint32_t x, uint32_t y) { //non-comutative hash return uinthash(uinthash(x)) ^ uinthash(y) ^ seed; }