RSA Encryption & Decryption - Project Toolsuite

⚠️ PRIVACY-FIRST RSA CRYPTOGRAPHY

Key Management Notice: Private keys should never be shared or uploaded to untrusted sites. All keys are generated and cryptography operations are executed 100% locally in your browser sandbox using the Web Crypto API. No data is stored or transmitted.

🔑 RSA Key Pair Generator

Key Size:

Public Key (For Encryption)

Private Key (For Decryption)

RSA Key Size (Required for import validation)

Max plaintext size:
2048-bit: 190 chars | 3072-bit: 318 chars | 4096-bit: 446 chars

Public Key (PEM format)

Plaintext Message 0 characters

Encrypted Ciphertext (Base64)

RSA Key Size (Required for import validation)

Private Key (PEM format) Ciphertext to Decrypt (Base64 format)

Decrypted Plaintext

System Ready: Generate keys or choose a tab to begin...

Understanding RSA Cryptography

How Asymmetric Crypto Works

Unlike symmetric encryption (like AES) which uses a single secret key, RSA uses a mathematically-linked **key pair**:

Public Key: Can be shared freely with anyone. Used strictly to **encrypt** messages.
Private Key: Must be kept secure and private. Used strictly to **decrypt** messages encrypted by the matching public key.

Plaintext Size Limits & Padding

This tool uses RSA-OAEP (Optimal Asymmetric Encryption Padding) with SHA-256:

OAEP pads plaintext messages dynamically to prevent eavesdroppers from recognizing repeating patterns.
This padding has a fixed size overhead of 66 bytes when using SHA-256. Therefore, the maximum plaintext character limit is strictly capped depending on key bits.