A cryptographic hash function is a hash function which takes an input (or 'message') and returns a fixed-size string of bytes. The string is called the 'hash value', 'message digest', 'digital fingerprint', 'digest' or 'checksum'. The ideal hash function has three main properties:
sha-1 е криптографска хеш-функция създадена от Агенцията за национална сигурност на САЩ и публикувана от Националния институт за стандартизация (nist) в САЩ като правителствен стандарт за обработка на информация. sha-1은 sha 함수들 중 가장 많이 쓰이며, tls, ssl, pgp, ssh, ipsec 등 많은 보안 프로토콜과 프로그램에서 사용되고 있다. sha-1은 이전에 널리 사용되던 md5를 대신해서 쓰이기도 한다. 혹자는 좀 더 중요한 기술에는 sha-256이나 그 이상의 알고리즘을 사용할 것을 권장한다. HMAC-SHA1 generation In cryptography , an HMAC (sometimes expanded as either keyed-hash message authentication code or hash-based message authentication code ) is a specific type of message authentication code (MAC) involving a cryptographic hash function and a secret cryptographic key . sha-1 реалізує хеш-функцію, побудовану на ідеї функції стиснення.Входом функції стиснення є блок повідомлення довжиною 512 біт і вихід попереднього блоку повідомлення. SHA1 and other hash functions online generator sha-1 md5 md2 md4 sha256 sha384 sha512 ripemd128 ripemd160 ripemd256 ripemd320 whirlpool tiger128,3 tiger160,3 tiger192,3 tiger128,4 tiger160,4 tiger192,4 snefru gost adler32 crc32 crc32b haval128,3 haval160,3 haval192,3 haval224,3 haval256,3 haval128,4 haval160,4 haval192,4 haval224,4 haval256,4 Az sha1sum egy hash-függvényt kiszámító program, mely a 160 bites SHA1 algoritmust használja. Az internetről letöltött fájlok, CD-lemezképek épségének ellenőrzésére használják. A fájlokkal együtt letöltik a hash-értékek listáját. 概要 （2017年現在）SHA-0、SHA-1、SHA-2、SHA-3の4種類（ないし、SHA-0はSHA-1に含めて3種類）に大別される。 SHA-2まではMD5などと同じ Merkle–Damgård construction（en:Merkle–Damgård construction）のバリエーションと言える構造だが、SHA-3 は全く別の構造となっている。
Secure Hash Algorithm – ויקיפדיה
May 19, 2020
From Wikipedia, the free encyclopedia SHA-1 is a mathematical algorithm to hash a certain string, which creates a one-way change from the source string to the result. It is commonly used for security and data loss, but there may be other cases. Computer programs exist to crack SHA-1 hashes by hashing random strings and storing the result.
Conclusion: SHA-1 is as safe as anything against preimage attacks, however it is easy to compute, which means it is easier to mount a bruteforce or dictionary attack. (The same is true for successors like SHA-256.) Depending on the circumstances, a hash function which was designed to be computationally expensive (such as bcrypt) might be a better choice. certutil -hashfile sha1 FAILED - Microsoft® Community CertUtil -hashfile gpg4win-3.0.3.exe SHA1. Regards, Randy. 52 people were helped by this reply SHA1 vs md5 vs SHA256: which to use for a PHP login 2 days ago · That's if you are letting the hacker try to logon with the salted sha-1 instead of a password like a normal logon. The best bet is to limit bad logon attempts to some reasonable number - 25 for example, and then time the user out for a minute or two. And if the cumulative bady logon attempts hits 250 within 24 hours, shut the account access SHA-1 produces a message digest based on principles similar to those used by Ronald L. Rivest of MIT in the design of the MD2, MD4 and MD5 message digest algorithms, but generates a larger hash value (160 bits vs. 128 bits). SHA-1 was developed as part of the U.S. Government's Capstone project.