Digital Signature, Electronic Signature, How digital signature works, Confidentiality of digital signature, Authenticity of digital signature, Integrity of digital signature, standard of digital signature, Algorithm of digital signature, Mathematical base of digital signature, parameters of digital signature, key computation of digital signature, key generation of digital signature, verification of of digital signature
Digital Signature, Electronic Signature, How digital signature works, Confidentiality of digital signature, Authenticity of digital signature, Integrity of digital signature, standard of digital signature, Algorithm of digital signature, Mathematical base of digital signature, parameters of digital signature, key computation of digital signature, key generation of digital signature, verification of of digital signature
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A presentation explaining the concepts of public key infrastructure. It covers topics like Public Key Infrastructure (PKI) introduction, Digital Certificate, Trust Services, Digital Signature Certificate, TLS Certificate, Code Signing Certificate, Time Stamping, Email Encryption Certificate
Key management: Introduction, How public key distribution done, Diffie Hellman Key Exchage Algorithm,Digital Certificate. Key Management using Digital certificate is done etc. wireshark screenshot showing digital cetificate.
Disgital Signature Algorithm which is used Hash value of a message when encrypted with the private key of a person is his digital signature on that e-Document.
Digital Signature of a person therefore varies from document to document thus ensuring authenticity of each word of that document.
As the public key of the signer is known, anybody can verify the message and the digital signature.
This PPT explains about the term "Cryptography - Encryption & Decryption". This PPT is for beginners and for intermediate developers who want to learn about Cryptography. I have also explained about the various classes which .Net provides for encryption and decryption and some other terms like "AES" and "DES".
A presentation explaining the concepts of public key infrastructure. It covers topics like Public Key Infrastructure (PKI) introduction, Digital Certificate, Trust Services, Digital Signature Certificate, TLS Certificate, Code Signing Certificate, Time Stamping, Email Encryption Certificate
Key management: Introduction, How public key distribution done, Diffie Hellman Key Exchage Algorithm,Digital Certificate. Key Management using Digital certificate is done etc. wireshark screenshot showing digital cetificate.
Disgital Signature Algorithm which is used Hash value of a message when encrypted with the private key of a person is his digital signature on that e-Document.
Digital Signature of a person therefore varies from document to document thus ensuring authenticity of each word of that document.
As the public key of the signer is known, anybody can verify the message and the digital signature.
Easy for the signer to sign a message
There is no point in having a digital signature scheme that involves the signer needing to use slow and complex operations to compute a digital signature.
Easy for anyone to verify a message
Similarly we would like the verification of a digital signature to be as efficient as possible.
Hard for anyone to forge a digital signature
It should be practically impossible for anyone who is not the legitimate signer to compute a digital signature on a message that appears to be valid. By “appears to be valid” we mean that anyone who attempts to verify the digital signature is led to believe that they have just successfully verified a valid digital signature on a message.
Asymmetric encryption, also known as public-key cryptography, is a type of encryption that uses a pair of keys to encrypt and decrypt data.
The pair of keys includes a public key, which can be shared with anyone, and a private key, which is kept secret by the Owner.
The sender uses the recipient’s public key to encrypt the data. The recipient then uses their private key to decrypt the data.
Digital Signature:A digital signature is a mathematical technique used to validate the authenticity and integrity of a message, software, or digital document.
Digital signatures can provide evidence of origin, identity and status of electronic documents, transactions or digital messages.
This PPT provides an complete reference of "DIGITAL SIGNATURE". It gives "how the digital signature are works?" and "why we need a digital signature?". And also I include some Digital signature algorithm in a Diagrammatic format.
This presentation covers:
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How does digital signature work?
Advantages and Shortcomings of Digital Signatures
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2. Agenda
• What is Digital Signature?
• How DS work?
• General Framework of DS
• Key Requirements
• Private Key Protection
• Benefits of Digital Signature
• Drawbacks of Digital Signature
• Applications
2
5. 5
What is Digital Signature?
• Digital Signature is a type of asymmetric
cryptography used to simulate the security properties
of a signature in digital, rather than written, form.
• Digital Signature is an electronic signature that can
be used to authenticate the identity of the sender of a
message or the signer of a document, and possibly to
ensure that the original content of the message or
document that has been sent is unchanged.
7. 7
How it work?
Message
+
Signature
Message
+
Signature
HashHash
Decrypt
Signature
With Sender’s
Public Key
Decrypt
Signature
With Sender’s
Public Key
SIGN hash
With Sender’s
Private key
SIGN hash
With Sender’s
Private key
Message
+
signature
Message
+
signature
COMPARECOMPARE
Calculated
Hash
Calculated
Hash
MessageMessage
Sender Receiver
HashHash
SignedMessage
Sent thru’ Internet
if
OK
Signatures
verified
8. 8
How it work ?
• The use of digital signatures usually involves two
processes, one performed by the signer and the other
by the receiver of the digital signature:
– Digital Signature Creation
• The process is performed by the sender of the
message.
– Digital Signature Verification
• The process is performed by the receiver of the
message.
9. 9
How it work ?
• Digital Signature Creation:
– Uses a hash result derived from and unique to both the signed
message and a given private key. For the hash result to be
secure, there must be only a negligible possibility that the same
digital signature could be created by the combination of any
other message or private key.
• Digital Signature Verification:
– is the process of checking the digital signature by reference to
the original message and a given public key, thereby
determining whether the digital signature was created for that
same message using the private key that corresponds to the
referenced public key.
11. 11
Key Requirements
• Each individual generates his own key pair, private
and public keys.
• Private key:
– Only known by the owner/sender
– Used to create the digital signature
• Public key
– It is known to everyone.
– Used to verify the digital signature.
12. 12
Key Requirements
• Digital Certificate:
– Digital Identity that establishes your credentials when doing
business or other transactions on the Web
– Issued by a Certifying Authority (CA)
– Contains your name, serial number, expiration dates, public
key, signature of CA.
• Certificate Authority:
– Trusted Third Party.
– An organization which issues public key certificates.
– Assures the identity of the parties to whom it issues
certificates.
– Maintains online access to the public key certificates issued.
14. 14
Benefits of Digital Signature
1. Authentication
– Digital signatures can be used to authenticate the source of
messages. When ownership of a digital signature secret key is
bound to a specific user, a valid signature shows that the message
was sent by that user.
– The importance of high confidence in sender authenticity is
especially obvious in a financial context.
15. 15
Benefits of Digital Signature
2. Integrity:
– In many scenarios, the sender and receiver of a message may
have a need for confidence that the message has not been altered
during transmission.
– Although encryption hides the contents of a message, it may be
possible to change an encrypted message without understanding
it.
– If a message is digitally signed, any change in the message will
invalidate the signature.
– Furthermore, there is no efficient way to modify a message and its
signature to produce a new message with a valid signature,
because this is still considered to be computationally infeasible by
most cryptographic hash functions.
16. 16
Paper Signature vs. Digital Signature
Parameter Paper Electronic
Authenticity May be forged Can not be copied
Integrity Signature independent
of the document
Signature depends on
the contents of the
document
Non-
repudiation
a. Handwriting
expert needed
b. Error prone
a. Any computer
user
b. Error free
17. 17
Drawbacks of Digital Signature
• The private key must be kept in a secure manner.
• The process of generation and verification of digital
signature requires considerable amount of time.
• For using the digital signature the user has to obtain
private and public key, the receiver has to obtain the
digital signature certificate also.
18. 18
Applications
• Electronic Mail
• Data Storage
• Electronic Funds Transfer
• Software Distribution
• Smart Cards
• Blind Signatures
• Time Stamped Signature