# What is public key cryptography PPT?

## What is public key cryptography PPT?

Public-Key Characteristics • Public-Key algorithms rely on two keys where: – it is computationally infeasible to find decryption key knowing only algorithm & encryption key – it is computationally easy to en/decrypt messages when the relevant (en/decrypt) key is known – either of the two related keys can be used for …

**What is the public key cryptography method?**

Public key cryptography uses a pair of keys to encrypt and decrypt data to protect it against unauthorized access or use. Network users receive a public and private key pair from certification authorities. If other users want to encrypt data, they get the intended recipient’s public key from a public directory.

### What are the applications of public key cryptography?

The main business applications for public-key cryptography are: Digital signatures – content is digitally signed with an individual’s private key and is verified by the individual’s public key. Encryption – content is encrypted using an individual’s public key and can only be decrypted with the individual’s private key.

**How public key cryptography may be used for authentication?**

The public key authentication protocol uses two keys per node, a public key for encryption and a private key for decryption. Everybody has access to the public key of a node, while the private key is secret. During authentication, random numbers are generated and exchanged, similar to the shared secret key protocol.

## What is Diffie Hellman key exchange algorithm?

The Diffie–Hellman (DH) Algorithm is a key-exchange protocol that enables two parties communicating over public channel to establish a mutual secret without it being transmitted over the Internet. DH enables the two to use a public key to encrypt and decrypt their conversation or data using symmetric cryptography.

**Which type of cryptography is called public key cryptography?**

Asymmetric cryptography

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.

### How many keys are used by public key?

two keys

In a public key system, two keys are used, one for encrypting and one for decrypting. The two keys are mathematically related to each other but knowing one key does not divulge the other key. The two keys are called the “public key” and the “private key” of the user.

**Which type of cryptography is also called public key cryptography?**

## What’s the difference between Diffie-Hellman and RSA?

The asymmetric key includes many cryptographic algorithms. Both Diffie- Hellman Key Exchange and RSA have advantages and disadvantages….Diffie- Hellman Key Exchange Vs. RSA.

Parameters | RSA | Diffie-Hellman (DH) Key Exchange |
---|---|---|

Key Strength | RSA 1024 bits is less robust than Diffie-Hellman. | Diffie-Hellman 1024 bits is much more robust. |

**What are two types of cryptography?**

Cryptography can be broken down into three different types:

- Secret Key Cryptography.
- Public Key Cryptography.
- Hash Functions.