e commerce.pptx
- 1. INTERNET AND E-COMMERCE TOPIC:- DIGITAL SIGNATURE , DIGITAL CERTIFICATE AND CRYPTOGRAPHY PRESENTED BY- LAKSHAY PARASHAR NEETU ATARE PRASHANT SINGH KUSHWAH B.COM {CA} 3RD SEMESTER PRESENTED TO - - ASS.PROFF BHARTI MAM
- 2. TABLE OF CONENT :- -TITLE’S - 1 MEANING OF DIGITAL SIGNATURE. 2 STEPS OF DIGITAL SIGNATURE. 3 DIGITAL CERTIFICATE. 4 CONTENT OF DIGITAL CERTIFICATE. 5 DIFFERENCE BETWEEN DIGITAL SIGNATURE V/S DIGITAL CERTIFICATE. 6 MEANING OF CRYPTOGRAPHY. 7 WHY WE USE CRTPTOGRAPHY. 8 CLASSIFICATION OF CRYPTOGRAPHY. 9 DIFFERENCE BETWEEN CLASSICAL V/S MODERN CRYPTOGRAPHY. 10 CONCLUSION.
- 3. MEANING DIGITAL SIGNATURE A digital signature is a mathematical technique used to validate the authenticity and integrity of a message, software or digital document. It's the digital equivalent of a handwritten signature or stamped seal, but it offers far more inherent security. A digital code which is attached to an electronically transmitted document to verify its contents and sender’s identity.
- 4. STEPS FOLLOWED IN CREATING A DIGITAL SIGNATURE • Message digest is computed by applying hash function on the message and then message digest is encrypted using private key of sender to form the digital signature. • Digital signature is then transmitted with the message. • Receiver decrypts the digital signature using the public key of sender. • The receiver now has the message digest. • The receiver can compute the message digest from the message. • The message digest computed by receiver and the message digest need to be same for ensuring integrity.
- 6. DIGITAL CERTIFICATE • Digital certificate is issued by a trusted third party which proves sender’s identity to the receiver and receiver’s identity to the sender. A digital certificate is a certificate issued by a Certificate Authority (CA) to verify the identity of the certificate holder. The CA issues an encrypted digital certificate containing the applicant’s public key and a variety of other identification information. Digital certificate is used to attach public key with a particular individual or an
- 7. DIGITAL CERTIFICATE CONTENT 1. NAME OF THE CERTIFICATE HOLDER 2. SERIAL NUMBER WHICH IS USED TO UNIQICKLY IDENTIFIED THE CERTIFICATE , AN INDIVIDUAL OR AN ENTITY IDENTIFY BY THE CERTIFICATE. 3. EXPIRATION DATE 4. COPY OF A CETIFICATE HOLDEROR PUBLIC KEY.(USED FOR DESCRYPTING MESSAGE AND DIGITAL SIGNATURE. 5. DIGITAL SIGNATURE OF THE CERTIFICATE ISSUING AUTHORITY 6. DIGITAL CERTIFICATE IS ALSO SEND WITH THE DIGITAL SIGNATURE AND MESSAGE
- 9. Digital certificate vs digital signature
- 10. WHAT IS CRYPOTOGRAPHY CRYPTOGRAPHY IS THE SCIENCE OF USING MATHEMATICS TO ENCRYPT AND DECRYPT A DATA . CRYPTOGRAPHY ENABLES US TO STORE SENSTIVE INFORMATION OR TRANSMIT IT ACROSS INSECURE NETWORKS SO, IT CAN NOT BE READ BY ANYONE INSTEAD OF A INTENDED RECIPIENT.
- 11. WHY WE USE CRYPTOGRAPHY • FOR ‘ SECRET WRITING ’ • TO ESTABLISH A SHARED SECRET WHEN OTHER PEOPLE ARE LISTENING.
- 13. SYMMETRIC KEY CRYPTOGRAPHY • What are symmetric keys in cryptography? • In cryptography, a symmetric key is one that is used both to encrypt and decrypt information. This means that to decrypt information, one must have the same key that was used to encrypt it.
- 14. CLASSICAL CRYPTOGRAPHY • IN The classical cryptography the original data i.e., the plain text is transformed into the encoded format i.e. cipher text so that we can transmit this data through insecure communication channels. A data string which known as key is used to control the transformation of the data from plain text to cipher text .
- 15. TRANSPOSITION CIPHER • .In cryptography, a transposition cipher is a method of encryption which scrambles the positions of characters (transposition) without changing the characters themselves • A simple example for a transposition cipher is columnar transposition cipher where each character in the plain text is written horizontally with specified alphabet width.
- 16. SUBSTITUTION CIPHER • A substitution cipher merely substitutes different letters, numbers, or other characters for each character in the original text. The most straightforward example is a simplistic substitution in which each letter of the alphabet is represented by a numerical digit, starting with 1 for A.
- 17. MODERN CRYPTOGRAPHY • Modern cryptography relies on cryptographic keys, usually a short string of text, for encoding and decoding messages in combination with cryptographic algorithms. Based on the type of keys used, cryptography is classified as either symmetric or asymmetric key cryptography
- 18. STREAM CIPHER • A stream cipher is an encryption technique that works byte by byte to transform plain text into code that's unreadable to anyone without the proper key. Stream ciphers are linear, so the same key both encrypts and decrypts message’s . EX- RC4/ARC4/ARCFOUR is a fast, simple encryption algorithm developed in 1987 to implement byte-by-byte encryption using 64 or 128 bits long keys. RC4 is widely used in Transport Layer Security, Secure Sockets Layer, and the IEEE 802.11 WLAN standard
- 19. BLOCK CIPHER • A block cipher is a method of encrypting data in blocks to produce cipher texts using a cryptographic key and algorithm. The block cipher processes fixed-size blocks simultaneously, as opposed to a stream cipher, which encrypts data consume one bit at a time consume . • EG:-
- 20. DIFFERENCE :-
- 21. ASYMMATRIC CRYPOTOGRAPHY- • Asymmetric cryptography, also known as public-key cryptography, is a process that uses a pair of related keys -- one public key and one private key -- to encrypt and decrypt a message and protect it from unauthorized access or use.
- 22. THANK YOU