Extract text from Cryptographic and cache files (CMS)
To convert CMS Cache files to another format, you need OpenSSL or other Encoded software.
To convert other file formats to the "Cryptographic Data & Cache" file type, you need software like OpenSSL or a similar tool.
The .cms file extension is heavily fragmented. Most often, it represents a Cryptographic Message Syntax file, defined by IETF RFC 5652. This format is used to digitally sign, digest, authenticate, or encrypt data. Software like OpenSSL or Microsoft Outlook processes these files for secure communications.
However, .cms is also widely used as a temporary cache format. For example, WhatsApp stores cached images as .cms files (usually disguised JFIF or WebP data). Additionally, some CCTV DVR systems save proprietary surveillance footage as .cms video files, and game engines like Unity use it for asset bundles (like 3D car models in Car Mechanic Simulator).
This fragmentation creates major headaches. If you receive a .cms file unexpectedly, your operating system will rarely know how to open it. Cryptographic files require specific keys and command-line tools to read. Surveillance .cms videos are proprietary and cannot be played by standard media players. WhatsApp cached images are annoying because they lack standard image extensions, preventing image viewers from loading them.
To solve this, conversion is essential. For cryptographic data, convert .cms to standard certificate formats like PEM or DER using OpenSSL. If the file is a cached image, converting it to JPG or PNG makes it visible in standard browsers. For surveillance video files, converting to MP4 is necessary for playback on standard devices. Drop your file here to analyze and convert it - free, online, and without installing software.
Convert.Guru analyzes your CMS file, detects the exact format, and lets you read the text inside.
Users also converted CMF, PDF, CMS21B, AVIF, CERT, CSM, HTML, JPG, JPEG, WEBP, DOCX, CRL and CSV files.
If you want to convert CMS file to JPG, PNG, OBJ, FBX, DAE, 3DS, MAX, BLEND, MA, MB, C4D or STL, you can use OpenSSL or similar software from the "Encrypted Data and Cached Images" category. In the File menu, look for Save As… or Export….
To convert DWG, DAE, X3D, IGES, WRL, JT, SKP, 3DS, 3DM, OBJ, STEP or FBX files to CMS, try OpenSSL or another comparable tool in the "Encrypted Data and Cached Images" category.
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our CMS converter.