AES Encryption & Decryption Tool

AES Encryption and Decryption: Core Features and Principles

Worried about sensitive data being stolen during transmission or storage? This tool provides symmetric encryption capabilities based on the Advanced Encryption Standard (AES). It can perform high-strength encryption on text to generate ciphertext, or reverse the process to decrypt valid ciphertext back to its original content. AES is a block cipher algorithm. Its core principle involves dividing data into fixed 128-bit blocks and applying multiple rounds of substitution and permutation to achieve encryption. Decryption uses the same key to perform the reverse operation. The algorithm supports three key lengths: 128-bit, 192-bit, and 256-bit. The longer the key, the higher the security.

Why Choose Our AES Encryption and Decryption Tool?

• Full AES standard support: Covers AES-128, AES-192, and AES-256 key strengths, as well as mainstream encryption modes like ECB and CBC.
• Flexible encoding adaptation: Output results support both Base64 and Hex encoding formats, seamlessly integrating with various system requirements.
• Zero-barrier operation: No professional software installation required; complete the entire encryption and decryption process directly in your browser.

How to Use This Tool

1. Select operation type: Click "Encrypt" or "Decrypt" to switch functions.
2. Input content: Paste your plaintext (for encryption) or ciphertext (for decryption) into the text box.
3. Set encryption parameters: Enter the secret key, select the AES mode (e.g., AES-256-CBC), and provide the corresponding IV value.
4. Execute: Click "Start Conversion" to get your encrypted or decrypted results.

Frequently Asked Questions (FAQ)

How long should an AES encryption key be?
128, 192, or 256 bits. The key length must strictly match the selected mode.

What could cause decryption to fail?
You must ensure that the secret key, IV value, and algorithm mode used during encryption perfectly match the decryption parameters. Any discrepancy will result in an error. For example, CBC mode requires the exact same 16-byte IV value.

Important Notes

Key management is crucial; a leaked key will result in complete data exposure. Encryption and decryption parameters must correspond exactly. When processing Chinese text, using UTF-8 encoding is recommended. For highly sensitive data, we recommend using offline tools.

Technical Notes & Best Practices

For encrypted data that requires long-term storage, we recommend using the AES-256-CBC mode and generating a random IV value. Example: Plaintext "Hello World" + Key "32-byte length key" + IV "random 16 bytes" encrypted via AES-256 will typically output a Base64 string in the format "U2FsdGVkX1+qvKDxZ...". When decrypting, the entire parameter chain must be fully restored.