RSA - RSA Online
RSA Online provides a complete client-side environment to generate RSA keys and perform encryption and decryption. The built-in RSA key generator follows the RSA algorithm and supports practical RSA cryptography with 1024-bit and 2048-bit key sizes. Use the guide below to learn what is an RSA key and test secure encryption and decryption in real time.
RSA Key Operations
RSA Results Display
RSA Online Tool - Complete Guide
About RSA Online
RSA Online is a client-side RSA tool that generates RSA key pairs and performs public key encryption and private key decryption. The RSA key generator uses the RSA algorithm and practical RSA cryptography to create 1024-bit or 2048-bit keys. You can learn what is an RSA key and test the complete RSA workflow in your browser.
- Generate RSA key pairs with 1024-bit or 2048-bit modulus lengths
- Use the RSA algorithm for public key encryption and private key decryption
- Work with RSA cryptography entirely in the browser using Web Crypto
- Export public and private keys in PEM format for secure use
- Understand what is an RSA key and how RSA works step by step
How to Use the RSA Key Generator
The RSA key generator on this page works in three simple steps. First, choose a key size and click Generate RSA Key Pair. Second, enter plaintext for encryption or ciphertext for decryption. Third, select Public Key Encryption or Private Key Decryption and click the operation button. The RSA Online tool instantly shows the public key, private key, and operation result.
- Select 1024-bit (Fast) or 2048-bit (Recommended) in the RSA key generator
- Click Generate RSA Key Pair and wait for the RSA key generation to finish
- Enter the text you want to encrypt or decrypt in the input box
- Choose Public Key Encryption or Private Key Decryption
- Click Encrypt or Decrypt and copy the result with the copy button
RSA and RSA Cryptography: How the RSA Algorithm Works
RSA is an asymmetric cryptography method based on the difficulty of factoring large prime numbers. The RSA algorithm starts by generating two large primes, p and q, and then calculates the modulus n = p × q. Euler's totient function φ(n) = (p-1) × (q-1) is computed, and a public exponent e is chosen. The private exponent d is calculated as the modular inverse of e. This is the core of RSA cryptography.
- The public key contains the modulus n and the public exponent e
- The private key contains the modulus n and the private exponent d
- RSA cryptography uses RSA-OAEP with SHA-256 for secure padding
- 1024-bit RSA keys support about 117 UTF-8 characters, and 2048-bit keys support about 245 characters
- Always keep the private key secure and do not share it
RSA Online FAQ: What is RSA?
RSA is an asymmetric cryptographic algorithm widely used for secure data transmission. The meaning of RSA is Rivest-Shamir-Adleman, named after its inventors. Many people ask "what is RSA" when they first see RSA online tools. In practice, RSA uses a public key for encryption and a private key for decryption, so the public key can be shared openly without compromising security.
RSA Online FAQ: What Does RSA Stand For?
The RSA full form is Rivest-Shamir-Adleman. If you ask "what does RSA stand for", the answer is the surnames of Ron Rivest, Adi Shamir, and Leonard Adleman, who first publicly described the algorithm in 1977. The RSA meaning goes beyond the acronym: it represents a practical implementation of public-key cryptography used in HTTPS, SSH, digital signatures, and secure email.
RSA Online FAQ: What is an RSA Key?
An RSA key is a cryptographic key used in the RSA algorithm. An RSA key pair consists of a public key and a private key. The public key can be shared with anyone, while the private key must remain secret. In this RSA Online tool, the RSA key generator creates both keys and displays them in PEM format. Understanding what is an RSA key helps you use public key encryption and private key decryption correctly.