sha1

As there have been significant advances in the cryptoanalysis of SHA1 it's supposed to be phased out in favor of SHA2 ( wikipedia ). For use as underlying hash function in PBKDF2, however, it's basically used as a PRNG. As such it should be still secure to use SHA1 as hash for PBKDF2, right? None of the currently known weaknesses on SHA-1 has any impact on its security when used in HMAC, a fortiori when used in PBKDF2. For that matter, MD5 would be fine too (but not MD4). However, SHA-1 is not good for public relations: if, in 2011, you use SHA-1, then you must prepare yourself to have to

MD5加密算法 算法简介 MD5的全称是Message-Digest Algorithm 5（信息- 摘要算法 ），在90年代初由Mit Laboratory for Computer Science和Rsa data security inc的Ronald l. rivest开发出来，经md2、md3和md4发展而来。它的作用是让大容量信息在用 数字签名软件 签署私人密匙前被“压缩”成一种保密的格式（就是把一个任意长度的字节串变换成一定长的大整数）.不管是md2、md4还是 md5 ，它们都需要获得一个随机长度的信息并产生一个128位的信息摘要. MD5 算法的 哈希值 大小为 128 位。是一种不可逆的算法。 算法特点 两个不同的明文不会得到相同的输出值 MD5结果不能反推明文，不可逆 安全性 从安全的角度讲，MD5的输出为128位，若采用纯强力攻击寻找一个消息具有给定 Hash 值的计算困难性为2128，用每秒可试验1000000000个消息的计算机需时1.07×1022年。若采用 生日攻击 法，寻找有相同Hash值的两个消息需要试验264个消息，用每秒可试验1000000000个消息的计算机需时585年。 实际应用上，例如我知道‘password’的MD5值是5f4dcc3b5aa765d61d8327deb882cf99，那么我就用一个数据库存起来

I need an hash algorithm that outputs an alphanumeric string that is max 20 characters long. For "alphanumeric" I mean [a-zA-Z0-9] . Inputs are UUID s in canonical form (example 550e8400-e29b-41d4-a716-446655440000 ) In alternative is there a way to convert a SHA1 or MD5 hash to a string with these limitations? Thanks. EDIT Doesn't need to be cryptographically secure. Collisions make data inaccurate, but if they happen sporadically I can live with it. EDIT 2 I don't know if truncating MD5 or SHA1 would make collisions happen too often. Now I'm wondering if it's better to truncate to 20 chars a

I am obtaining a Google Play API key from Google, and it is asking to enter SHA1 fingerprint. I want to know what is SHA1 fingerprint? I also wanted to know weather this API key can be used from another computer/pc? It is a standard for the implementation of a 'secure hash algorithm' - a one-way cryptographic function that can be used to act as a 'signature' of a sequence of bytes. It is very unlikely that 2 different byte sequences would produce the same value (though not impossible) http://en.wikipedia.org/wiki/SHA-1 Note that there are other, more robust standards out there these days e.g.

I got the following code: import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; public class Sha1{ private static final char[] HEX_CHARS = null; public static void main(String[] args){ String hash = toSHA1(("27"+"peojvootv").getBytes()); System.out.println(hash); } public static String toSHA1(byte[] convertme) { MessageDigest md = null; try { md = MessageDigest.getInstance("SHA-1"); } catch(NoSuchAlgorithmException e) { e.printStackTrace(); } byte[] buf = md.digest(convertme); char[] chars = new char[2 * buf.length]; for (int i = 0; i < buf.length; ++i) { chars[2 *

I'm trying to replicate some C# code in PHP5 and am having some difficulties. The C# code is as following, and it is important to note that it cannot be changed: string s = strToHash; UnicodeEncoding encoding = new UnicodeEncoding(); byte[] bytes = encoding.GetBytes(s); SHA1Managed managed = new SHA1Managed(); bytes = encoding.GetBytes(Convert.ToBase64String(managed.ComputeHash(bytes)) + "Space"); return Convert.ToBase64String(managed.ComputeHash(bytes)); The PHP code I've written to replicate this is as follows: utfString = mb_convert_encoding($strToHash,"UTF-16"); hashTag = sha1($utfString

After making the app, I want the Logcat to print the SHA-1 key of the app in its logs. Instead of running keytool -list -v -keystore ~/.android/debug.keystore -alias androiddebugkey -storepass android -keypass android command. Regardless the app is in debug/ release mode. Is this possible to be done in android studio ? Ofcourse after testing I will remove the logcat line so that others possible can't debug it. Personally, I would use SHA256 instead of SHA1. That's what I did in SignatureUtils in my CWAC-Security library : /*** Copyright (c) 2014 CommonsWare, LLC Licensed under the Apache

I need to digitally sign a String using the SHA-1 digest algorithm first and then apply the RSA algorithm, using a PrivateKey to sign it. I already have the PrivateKey stored in my database as data type char(250) in base64. My problem is that I don't know how to convert it into a PrivateKey for using it for signing in: Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.ENCRYPT_MODE, privateKey); byte[] cipherText = cipher.doFinal(digest); Digest was an array of bytes to which I applied the SHA-1 digest algorithm: MessageDigest md = MessageDigest.getInstance("SHA-1"); byte [] ba =