Signing an e-mail message means that you attach your Digital Certificate to it so that the recipient knows it came from you and was not tampered with en-route to their inbox

1. Digital Signature Usage
Can I use one digital certificate for multiple e-mail addresses?
No, you cannot. A digital certificate e-mail address combination is unique.
What is the scope of using digital signatures for e-tendering systems?
Digital signatures for e-tendering are allowed, though with limited scope.The following transactions/instruments are not recognized as per the IT Act
2000:
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Negotiable Instrument as defined in section 13 of 26 of 1881.The Negotiable Instrument Act,1881.
A Power-of-Attorney.
Succession Act/Will.
Trust
Transfer of Immovable property
Trust
Can digital signatures be used in wireless networks?
Yes, digital signatures can be employed in wireless networks
Digital Signature Usage EMAIL SECTION:
What is the difference between signing and encrypting an e-mail?
Signing an e-mail message means that you attach your Digital Certificate to it so that the recipient knows it came from you and was not tampered with
en-route to their inbox. Signing authenticates a message, but it does not provide protection against third party monitoring.Encrypting a message means
scrambling it in such a way that only the designated recipients can unscramble it. This safeguards messages against monitoring or interception. In
order to send a signed message, you must have a Digital Certificate. Since message encryption is done using specific keys available in the certificate,
you cannot encrypt a message unless you possess the recipient's Digital Certificate.
Can I send a secure e-mail to someone who does not have Digital Certificate?
You can digitally sign any e-mail as long as the recipient has an e-mail application, which supports S/MIME. However, you cannot encrypt a message,
unless you have the recipient's Digital Certificate.
How do I know if the e-mail I have received is digitally signed or encrypted?
Microsoft Internet Explorer Users: Signed messages will be shown in the inbox (or any other folder) with a red ribbon on the envelope icon. Encrypted
messages will show a padlock on the envelope icon.
Netscape Communicator Users: Any signed e-mail you receive will have a prominent icon in the upper-right corner of the message saying "signed" or
"encrypted" or both. If you want more information about the security of a message, click on the Security button (padlock icon) above the message.
Where can I use digital certificates?
You can use Digital Certificates for the following:
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How
For secure email and web-based transactions, or to identify other participants of web-based transactions.
To prove ownership of a domain name and establish SSL / TLS encrypted secured sessions between your website and the user for web based transactions.
As a developer, for proving authorship of a code and retaining integrity of the distributed software programs.
For signing web forms, e-tendering documents, filing income tax returns, to access membership-based websites automatically without entering a user
name and password etc.
does
a
Digital
Signature
work?
A digital certificate explicitly associates the identity of an individual/device with a pair of electronic keys - public and private keys - and this association is endorsed
by the CA. The certificate contains information about a user's identity (for example, their name, email address, the date the certificate was issued and the name of the
Certifying Authority that issued it