Contact COOK | COOK. MyProxy Credential Management Service. The Hash Function Zoo - The ECRYPT Hash Function Website. SHA-2. SHA-2 is a set of cryptographic hash functions (SHA-224, SHA-256, SHA-384, SHA-512, SHA-512/224, SHA-512/256) designed by the U.S. National Security Agency (NSA) and published in 2001 by the NIST as a U.S. Federal Information Processing Standard (FIPS). SHA stands for Secure Hash Algorithm. SHA-2 includes a significant number of changes from its predecessor, SHA-1. SHA-2 currently consists of a set of six hash functions with digests that are 224, 256, 384 or 512 bits. SHA-256 and SHA-512 are novel hash functions computed with 32 and 64-bit words, respectively. In 2005, security flaws were identified in SHA-1, namely that a mathematical weakness might exist, indicating that a stronger hash function would be desirable.[4] Although SHA-2 bears some similarity to the SHA-1 algorithm, these attacks have not been successfully extended to SHA-2.
Hash standard[edit] One iteration in a SHA-2 family compression function. The bitwise rotation uses different constants for SHA-512. Applications[edit] The Open–source PKI Book. Symeon (Simos) Xenitellis OpenCA Team Copyright © 1999, 2000 by Symeon (Simos) Xenitellis This document describes Public Key Infrastructures, the PKIX standards, practical PKI functionality and gives an overview of available open–source PKI implementations. Its aim is foster the creation of viable open–source PKI implementatations. The latest version of this document can be found at the OSPKI Book WWW site at. Comparison of cryptographic hash functions. Filesystem-level encryption. Filesystem-level encryption, often called file/folder encryption, is a form of disk encryption where individual files or directories are encrypted by the file system itself.
This is in contrast to full disk encryption where the entire partition or disk, in which the file system resides, is encrypted. Types of filesystem-level encryption include: the use of a 'stackable' cryptographic filesystem layered on top of the main file systema single general-purpose file system with encryption The advantages of filesystem-level encryption include: General-purpose file systems with encryption[edit] Unlike cryptographic file systems or full disk encryption, general-purpose file systems that include filesystem-level encryption do not typically encrypt file system metadata, such as the directory structure, file names, sizes or modification timestamps.
One exception to this is the encryption support being added to the ZFS filesystem. Cryptographic file systems[edit] See also[edit] Encryption software. Encryption software is software whose main task is encryption and decryption of data, usually in the form of files on (or sectors of) hard drives and removable media, email messages, or in the form of packets sent over computer networks.
Encryption[edit] Encryption software executes an algorithm that is designed to encrypt computer data in such a way that it cannot be recovered without access to the key. Software encryption is a fundamental part of all aspects of modern computer communication and file protection and may include features like file shredding. The purpose of encryption is to prevent third parties from recovering the original information. This is particularly important for sensitive data like credit card numbers. Encryption choices[edit] Choosing encryption[edit] There are several factors that affect the choice of an encryption algorithm including speed and security. , of each byte of plain text , to produce a cipher value Applications[edit] Network traffic encryption tools.
Network Encryption.