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Public Key Cryptography

Public Key Cryptography is a system of cryptography using two sets of keys: private and public.
It can be used in the following ways:
For Secure Communications

  • The reciever's public key can be used to encrypt a message
  • The message can only be decrypted using the reciever's private key

For Digital Signatures

  • The private key can be used to sign a message
  • The public key can be used to verify that the message was actually signed using the private key

Types of authentication protocols

  • GPG (GNU Privacy Guard) Keys
  • SSH (Secure SHell) Keys
  • X.509 Certificates issued by CA for S/MIME Authentication

Digital signature algorithms

  • DSA (Digital Signature Algorithm)
  • RSA (Rivest-Shamir-Adleman)
  • ECDSA (Elliptic Curve Digital Signature Algorithm)

Tags:
cryptography

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