What is encryption,what is digital signature,what is PKI

2. Encryption It is a technique of converting plain text into ciphertext and reconverting it into plain text .

5. Basic Techniques of Encryption- Transposition Cipher WE WILL ATTACK ON BHAI ON SUNDAY LL ATWE WI ON BHTACK SUNDAAI ONY TRANSPOSE

7. Basic Techniques of Encryption- Substitution Cipher INDORE IS A GOOD CITY DKILQS DR M BLLI NDTY SUBSTITUTE

9. Basic Techniques of Encryption- Product Cipher INDORE IS A GOOD CITY DKILQS DR M BLLI NDTY SUBSTITUTE TRANSPOSE S DR DKILQI NDTM BLLY

15. Ways of Encryption Two ways of encryption Symmetric Key or Private Key Encryption Asymmetric Key or Public Key Encryption (abbreviated as PKI)

16. Symmetric Cryptosystem Also called private key infrastructure Cleartext Message Cipher Text Cleartext Message DES | RC4 DES | RC4 Four score and seven years ago, our forefathers brought forth the proposition Four score and seven years ago, our forefathers brought forth the proposition sdfklj98a475$56jhgv98456vjnf84576FGHH78lfkghj-506#6lkjg4#$5;lkn;t7;lsk%0

19. Public Key System One half of a key pair is used to encrypt, the other half is used to decrypt. Encryption Recipient’s Public Key Recipient’s Private Key Decryption

26. How does PKI work? Original Message Encrypted & Signed Sender’s Private Key Hash Code Digital Signature Symmetric Key Recipient’s Public Key Encrypted Symmetric Key Sender Original Message

27. How does PKI work? Encrypted & Signed Symmetric Key Encrypted Symmetric Key Recipient’s Private Key Original Message Hash Algorithm Hash Code Digital Signature Sender’s Public Key Message verified Recipient

28. Digital Certificate Certificate ties a participant to public key The authenticity of the certificate is guaranteed by the digital signature generated using the CA’s private key. Validity Period Expires: 31 December 2022 Public Key: Signed: CA’s Signature Name: Prashant Mali Number: 2564567A ID Number & Name A Digital Certificate is a digitally signed document that associates a public key with a user. private

29. Key Lifecycle Management Key Generation Certificate Issuance Key Usage or Certificate Validation Key Expiry Key Update

31. Thank You Questions Contact: prashant . [email_address] cyberlawconsulting @gmail.com Cell: 9821763157