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Gmail S/MIME
Gmail S/MIME is a Firefox extension that allows you to send and receive signed and encrypted messages in Gmail....
GMail encrypted messages signed messages Gmail encryption S/MIME
Jar::Signer
Jar::Signer Perl module ease the process of creating a signed Jar file....
PortableSigner
A signing (with X.509 certificates) program for PDF files....
PinePGP
PinePgp is set of display and sending filters which enables pine to send and receive signed and/or encrypted e-mails....
sdecstr
Decimal datatype stored as a signed string, enabling rich comparisons...
Gmail S/MIME for Firefox
Send and receive signed and encrypted messages in Gmail...
GMail encrypted messages signed messages Gmail encryption S/MIME