Text Encryption & Decryption

Text encryption transforms readable plaintext into scrambled ciphertext using a mathematical algorithm and a secret key. Only someone possessing the correct key can reverse the process (decryption) to recover the original message. This fundamental concept underlies all secure digital communication.



This tool implements symmetric encryption algorithms where the same password is used for both encryption and decryption. When you enter text and a password, the tool derives a cryptographic key from your password using a key derivation function. The plaintext is then processed through the selected cipher algorithm block by block, producing ciphertext that appears as random characters.



AES (Advanced Encryption Standard) is the most widely used algorithm, adopted by governments and corporations worldwide. It operates on 128-bit blocks using key sizes of 128, 192, or 256 bits. The tool may also offer simpler ciphers like Caesar shift or Base64 encoding for educational purposes, though these are not cryptographically secure.



All encryption and decryption operations execute entirely in your browser using JavaScript cryptographic libraries. Your plaintext, passwords, and ciphertext never leave your device, ensuring that sensitive messages remain private throughout the process.

1. Secure Message Sharing
When you need to send sensitive information (account details, personal data, confidential notes) through insecure channels like email or messaging apps, encrypting the text first ensures that only the intended recipient — who knows the password — can read it.



2. Password-Protected Notes
Store encrypted versions of sensitive notes, journal entries, or private documents in cloud storage or note-taking apps. Even if someone gains access to your files, the encrypted content remains unreadable without the decryption password.



3. Learning Cryptography Concepts
Students and developers exploring information security can experiment with different cipher algorithms to understand how encryption strength varies. Comparing AES output with a simple Caesar cipher illustrates why modern algorithms are necessary for real security.



4. Developer Testing & Debugging
Software developers building applications with encryption features can use this tool to quickly generate test ciphertext, verify decryption logic, or debug encoding issues without writing throwaway code or setting up test harnesses.



5. Data Privacy Compliance
Organizations handling personal data under regulations like GDPR or HIPAA can encrypt text fields before storing them in databases or transmitting them across networks, adding a layer of protection that satisfies regulatory encryption requirements.

• Use strong, unique passwords: Encryption is only as secure as your password. Use at least 12 characters with a mix of uppercase, lowercase, numbers, and symbols. A weak password can be brute-forced regardless of the algorithm.



• Choose AES for real security: If the tool offers multiple algorithms, always use AES-256 for genuinely sensitive data. Simpler ciphers like Caesar or XOR are educational but trivially breakable.



• Save your password separately: If you lose the encryption password, the data is unrecoverable. Store passwords in a dedicated password manager, never alongside the encrypted text.



• Understand encoding vs. encryption: Base64 encoding is NOT encryption — it is trivially reversible by anyone. True encryption requires a secret key and a proven algorithm.



• Share keys through a different channel: If emailing encrypted text, share the password via phone call, text message, or in person. Sending the password alongside the ciphertext defeats the purpose.



• Verify decryption round-trips: After encrypting, always test decryption with your password to confirm the original text is recovered correctly before deleting the plaintext.



• Be aware of character encoding: Special characters, emojis, and non-Latin scripts may behave differently across encryption implementations. Test with your actual content before relying on the output.