![]() On macOS/Linux with Bash (CLI) it’s the same process, but this time we specify the -decode option: SG9va2VkIG9uIHBob25pY3Mgd29ya2VkIGZvciBtZQo= Decoding Strings > ::ToBase64String(::UTF8.GetBytes("Hooked on phonics worked for me")) On Windows, we can encode a string with PowerShell (CLI): $: echo "Hooked on phonics worked for me" | base64 On macOS/Linux with Bash (CLI) we can simply echo the target string and pipe it to the base64 utility: Let’s take a look at not only decrypting but also encrypting because, who knows? Maybe one day you will need or want to know both sides of the process. If the string contains special characters like “+” or “/” then there is a good chance the string will decode into something like a compressed file or image.Ī good rule of thumb for this is to decrypt the string on the command line, and if you cannot read the output then try writing it to a file and use something like Detect It Easy (D.I.E.) to determine how you can view the file contents.ĭecryption is extremely easy and can be done on any OS.If the string does not contain any special characters other than “=” then there is a good chance that it will be plain text when decrypted.There are a few things that I like to look for with base64 strings: The wiki article here goes into more details about the background of the encoding’s implementation and history, but here we’ll focus on the practical aspects within a security context. These strings must also be divisible by 4 to be well-formed. There are 64 characters in the Base64 “alphabet”, and an encoded string will contain a mixture of uppercase and lowercase letters, numbers, and sometimes an “=” or two (never more than two) at the end. VGhpcyBpcyB3aGF0IGJhc2U2NCBsb29rcyBsaWtlIGluIHRoZSB3aWxkLgo= These are the methods that I use to both encode and decode in my daily work.Ī base64 string is pretty easy to identify: In this article, I will share both a simple and a slightly more advanced understanding of Base64 encoding. The most common methods are not terribly hard to learn and will help you to make better decisions on the legitimacy of a command or call seen on your network. Understanding the encoding methods threat actors use can help not only in everyday operations but importantly in cybersecurity and network security contexts. They are also widely used by malware authors to disguise their attacks and to implement anti-analysis techniques designed to frustrate malware hunters and reverse engineers. I added these methods to a utility class.Encoded strings are everywhere and have many legitimate uses across the technology sector. $dec = safeDecrypt ( $enc, $key ) //decrypts encoded string generated via safeEncrypt functionĭEx9ATXEg/eRq8GWD3NT5BatB3m31WEDEYLK2V4L0Am5GZGoa2rvYWUpoUeCrm7W/pdgLJrNoE6AA8U=Ĭlearly there isn't much support or documentation for this yet.īased off the same safeEncrypt implementation here and elsewhere, I updated it to work for me (I'm running libsodium 1.0.8). #Php salt and base64 encoding archiveGetting 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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