Modern Cryptography
Symmetric key cryptography:
It refers to encryption methods in
which both sender and receiver share the same key. It is the traditional
encryption policy that was invented in 1976. It has the block cipher as
well as stream cipher for their elimination for their application.
The
cryptographic functions do not use keys but are related and important class of
cryptographic algorithms. They take input data and produces output data in a
short fixed manner.
Public key cryptography:
In Public key cryptology there are
two differences but are mathematical related keys are used.
1. Public Key
2. Private Key
A public key system is constructed
in a manner so that calculation of one key (Private Key) is infeasible from the
other key.
In public key cryptology may be
freely distributed while its paired private key must remain secret.
The public key is typically used
for encryption and private key is used for decryption in other manner we can
describe it as one key is used to process the message and other key is used for
verification.
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