This allows fingerprints of very large files to be easily recorded, and if needed sent via email or otherwise published. Small fingerprint size of exactly 32 bytes (256 bits), regardless of the source file.This keeps the contents of your file secret, even from us.It is essentially impossible to retrieve the contents of the original file from its SHA-2 fingerprint.This prevents someone from forging a back-dated timestamp. This is much longer than the age of the earth. Even if someone had 1000 computers, each being unrealistically fast and able to produce 40 billion SHA-2 fingerprints of files each second, they would have to keep trying for 4.8 × 10 37 files, or 3.8 x 10 16 years, to achieve only a 1% chance in forging a timestamp.Neither intentionally nor by coincidence. It is essentially impossible to make a file with different contents that would have the same SHA-2 fingerprint.SHA-2 Fingerprinting has these properties:.Instead, its SHA-2 fingerprint (more info), is transmitted and stored in our database to enable easy on-line verification of the file's time stamp. Your file is never transmitted to us or stored.Total confidentiality and secrecy of your document, which is also secret from us.SHA-2 validity chain is intermittently published in other media, which preserve the time-stamp integrity, even if the above methods were to lose credibility due to events such as server security compromise.Electronically Signed Certificate is issued which allows off-line verification of authenticity, even if our database were to become unavailable.Time Stamps are recorded in our database.Several different methods maintain the integrity of the time-stamping record, even if some of these methods were to cease to function or if they were to lose credibility due to unforeseen compromise of our server's security, or unforeseen compromise of one of the cryptographic methods.Well-known and widely-accepted Mathematical, Cryptographic and Database Methods are used to provably record the existence of your file, in a way that keeps the file contents secret, and is considered impossible to forge.Timestamping authority that provides extremely robust proof that your invention, copyrightable work, design, idea, or document existed today.There are no user contributed notes for this page. Getting Started Introduction A simple tutorial Language Reference Basic syntax Types Variables Constants Expressions Operators Control Structures Functions Classes and Objects Namespaces Enumerations Errors Exceptions Fibers Generators Attributes References Explained Predefined Variables Predefined Exceptions Predefined Interfaces and Classes Context options and parameters Supported Protocols and Wrappers Security Introduction General considerations Installed as CGI binary Installed as an Apache module Session Security Filesystem Security Database Security Error Reporting User Submitted Data Hiding PHP Keeping Current Features HTTP authentication with PHP Cookies Sessions Dealing with XForms Handling file uploads Using remote files Connection handling Persistent Database Connections Command line usage Garbage Collection DTrace Dynamic Tracing Function Reference Affecting PHP's Behaviour Audio Formats Manipulation Authentication Services Command Line Specific Extensions Compression and Archive Extensions Cryptography Extensions Database Extensions Date and Time Related Extensions File System Related Extensions Human Language and Character Encoding Support Image Processing and Generation Mail Related Extensions Mathematical Extensions Non-Text MIME Output Process Control Extensions Other Basic Extensions Other Services Search Engine Extensions Server Specific Extensions Session Extensions Text Processing Variable and Type Related Extensions Web Services Windows Only Extensions XML Manipulation GUI Extensions Keyboard Shortcuts ? This help j Next menu item k Previous menu item g p Previous man page g n Next man page G Scroll to bottom g g Scroll to top g h Goto homepage g s Goto search
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