RSA Key Generation, Signatures, and Encryption using OpenSSL | Encryption Decryption using openSSL

Demonstration of using OpenSSL to create RSA public/private key pair, sign and encrypt messages using those keys, and then decrypt and verify the received messages. Commands used: OpenSSL.

Learn Data Structures and Algorithms – Introduction and Learning Resources

Encryption And Decryption

Encryption is converting data into an unreadable form by unauthorized parties. This is done by using a mathematical algorithm to scramble the data and then using a key to unscramble it. The key is information known only to the sender and receiver of the encrypted data.

Decryption is the process of converting encrypted data back into its original form. This is done using the same mathematical algorithm and key to encrypt the data.

Encryption is used to protect data from unauthorized access. For example, it covers credit card numbers when transmitted over the internet and saves passwords when stored on computers.

There are two main types of encryption: symmetric encryption and asymmetric encryption.

• Symmetric encryption uses the same key to encrypt and decrypt data. This is the simplest type of encryption but also the least secure.
• Asymmetric encryption uses two keys: a public key and a private key. The public key can encrypt data, but only the private key can decrypt it. This makes asymmetric encryption more secure than symmetric encryption.

Encryption is an integral part of information security. It helps protect data from unauthorized access and is critical to many security technologies, such as SSL/TLS and SSH.

Here are some examples of encryption:

• HTTPS (Hypertext Transfer Protocol Secure) is the secure version of HTTP. It uses encryption to protect data that is transmitted over the internet.
• SSH (Secure Shell) is a secure protocol for remote computers. It uses encryption to protect data transmitted between the client and server.
• PGP (Pretty Good Privacy) is a software program to encrypt and decrypt data. It is a popular choice for encrypting email messages.

Encryption is a powerful tool that can be used to protect data. However, it is essential to remember that no encryption method is perfect. If an attacker is determined enough, they may be able to break through even the most secure encryption.

Here are some tips for using encryption effectively:

• Use a robust encryption algorithm.
• Use a long key.
• Change your keys regularly.
• Be careful about who you share your keys with.
• Use encryption in conjunction with other security measures.