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S/MIME (Secure/Multipurpose Internet Mail Extensions) is a standard for public-key encryption and signing of MIME data. S/MIME is on an IETF standards track and defined in a number of documents, most importantly RFC 8551 .
Since the release of Firefox v57 and the migration from XUL based extension to WebExtensions, there has been no attempt to make a new add-on to support the new Firefox. Konqueror and Falkon, the official web browser of the K Desktop Environment (KDE) features KDE Wallet manager (KWallet) to store sensitive passwords encrypted.
Outlook on the web supports S/MIME and includes features for managing calendars, contacts, tasks, documents (used with SharePoint or Office Web Apps), and other mailbox content. In the Exchange 2007 release, Outlook on the web (still called Outlook Web App at the time) also offers read-only access to documents stored in SharePoint sites and ...
s/mime OpenPGP is a data encryption standard that allows end-users to encrypt the email contents. There are various software and email-client plugins that allow users to encrypt the message using the recipient's public key before sending it.
Multipurpose Internet Mail Extensions (MIME) is a standard that extends the format of email messages to support text in character sets other than ASCII, as well as attachments of audio, video, images, and application programs. Message bodies may consist of multiple parts, and header information may be specified in non-ASCII character sets.
CMS is used as the key cryptographic component of many other cryptographic standards, such as S/MIME, PKCS #12 and the RFC 3161 digital timestamping protocol. OpenSSL is open source software that can encrypt, decrypt, sign and verify, compress and uncompress CMS documents, using the openssl-cms command.
Numerous web browsers use a more limited form of content sniffing to attempt to determine the character encoding of text files for which the MIME type is already known. This technique is known as charset sniffing or codepage sniffing and, for certain encodings, may be used to bypass security restrictions too.
File extension(s) [a] MIME type [b] Official name [c] Platform [d] Description .br application/x-brotli Brotli: all Brotli is a compression algorithm developed by Google for textual web content, and typically achieves higher compression ratios than other algorithms for this use case.