RSA Encryption Tool

Key Generation
Encryption
Decryption
Digital Signature

Padding Scheme:

Output Format:

Padding Scheme:

Input Format:

Hash Algorithm:

Signature Format:

RSA Algorithm Quick Reference

Key Size Security Level Recommended Use Performance Impact
1024 bits Basic Non-sensitive data, testing Fastest
2048 bits Standard Most applications, general use Good balance
3072 bits High Sensitive data, longer-term security Slower
4096 bits Maximum Highly sensitive data, long-term security Slowest

Best Practices

  • For General Use: 2048-bit keys provide good security with reasonable performance.
  • For Maximum Security: Use 4096-bit keys when securing highly sensitive information.
  • Padding Scheme: OAEP is more secure than PKCS#1 v1.5 for encryption operations.
  • Large Files: For large files, use hybrid encryption (AES + RSA) instead of RSA-only.

About RSA Encryptor

An RSA Encryptor is a cryptographic tool that enables secure encryption of messages and data using the RSA (Rivest-Shamir-Adleman) algorithm. RSA is a widely used asymmetric encryption method that relies on a pair of public and private keys to ensure confidentiality, integrity, and authenticity of information.

Cybersecurity professionals, developers, and IT administrators use RSA encryption for secure communications, data protection, and digital signatures. The RSA algorithm is fundamental in secure web browsing (SSL/TLS), email encryption, and secure authentication systems.

Core Capabilities

  • Public-Key Encryption: Encrypts messages using a public key, which can only be decrypted with the corresponding private key.
  • Key Generation: Creates secure RSA key pairs (public and private keys) for encryption and decryption.
  • Message and File Encryption: Supports encrypting both text messages and binary files.
  • Cross-Platform Compatibility: Works with different operating systems and encryption libraries.
  • Secure Key Lengths: Supports RSA key sizes from 1024-bit to 4096-bit for varying security needs.

Common Use Cases

Securely Encrypting Messages

RSA encryption ensures that only the intended recipient can read a message by using their private key to decrypt it.

Example
Message:
Hello, this is a secure message.

Encrypted Output: 3a1f9b8... (ciphertext)

Protecting Sensitive Data

RSA is used to encrypt confidential files and documents before transferring them over networks.

Example
Input File:

confidential.pdf

Output File: confidential.pdf.enc

Implementing Digital Signatures

RSA is used to generate digital signatures, ensuring the authenticity and integrity of messages.

Example
Original Message:
Transaction ID: 56789

Generated Signature: 7e2d3a9... (encrypted hash)

Encrypting API Keys and Passwords

Developers use RSA encryption to protect API keys, credentials, and passwords stored in databases.

Example
Input API Key:
ABC123-XYZ789

Encrypted API Key: b21f4d9... (ciphertext)

Troubleshooting & Best Practices

Use Strong Key Sizes

RSA-2048 or higher is recommended for strong security.

Keep Private Keys Secure

Store private keys in a secure location, such as a hardware security module (HSM).

Avoid Encrypting Large Files Directly

RSA is best used for encrypting small messages; for large files, use hybrid encryption (e.g., AES + RSA).

Verify Keys Before Encryption

Ensure the public key used for encryption matches the intended recipient.

How to Use the RSA Encryptor

  1. Generate an RSA Key Pair: Create a secure public and private key pair.
  2. Encrypt Data with the Public Key: Use the recipient's public key to encrypt messages or files.
  3. Transmit the Encrypted Data: Send the encrypted text or file securely over the network.
  4. Decrypt with the Private Key: The recipient uses their private key to decrypt the message.

Specifications

  • Supported Key Sizes: 1024-bit, 2048-bit, 3072-bit, 4096-bit.
  • Encryption Modes: RSA-OAEP, RSA-PKCS#1 v1.5.
  • Supported Input Types: Text, files, binary data.
  • Output Format: Base64 or hexadecimal-encoded ciphertext.
  • System Compatibility: Works on Windows, macOS, Linux, iOS, and Android.
  • Browser Requirements: Compatible with Chrome, Firefox, Safari, and Edge.