Symmetric Crypto Online Tool

About 对称加密 (AES/DES)

The Symmetric Encryption tool lets you test and verify encryption and decryption workflows for AES, DES, Triple DES, RC4, and other symmetric ciphers directly in the browser. Ideal for learning how symmetric encryption modes work in cryptography courses, verifying the consistency of frontend and backend encryption/decryption logic, quickly generating test ciphertext or decrypting encrypted fields from debug logs, and understanding how different padding schemes (Pkcs7, ZeroPadding, etc.) affect encryption results.

How to Use Symmetric Crypto?

1Select the encryption algorithm (AES is recommended for modern security).
2Choose a strong 'Secret Key' and an optional IV (Initialization Vector).
3Enter your plaintext to encrypt, or paste a Base64 string to decrypt.
4Copy the resulting ciphertext or plaintext to your clipboard for secure storage.

Input

In encrypt mode, provide the plaintext string, a secret key, and an optional initialization vector (IV). In decrypt mode, provide a Base64-encoded ciphertext string along with the corresponding key and IV. You must also select the algorithm (AES / DES / Triple DES / RC4), encryption mode (CBC / CFB / CTR / OFB / ECB), and padding scheme (Pkcs7 / Iso97971 / AnsiX923 / Iso10126 / ZeroPadding / NoPadding).

Output

In encrypt mode, the output is a Base64-encoded ciphertext string that can be copied directly for transmission or storage testing. In decrypt mode, the output is the restored plaintext string. When decryption fails due to a mismatched key, incorrect IV, or inconsistent padding scheme, the tool returns a clear error message to help troubleshoot the issue.

How it works

The tool encrypts or decrypts using the selected algorithm, mode, and padding. Encryption outputs Base64 ciphertext. Decryption requires the same key, mode, padding, and IV to restore the plaintext. All operations stay local, and keys and plaintext are not uploaded.

Supported modes

AES encrypt/decrypt
DES encrypt/decrypt
Triple DES encrypt/decrypt
RC4 encrypt/decrypt
CBC/CFB/CTR/OFB/ECB modes
6 padding schemes
Random key generation

AES-CBC encryption input-to-output example

Input example

Algorithm: AES | Mode: CBC | Padding: Pkcs7
Key: my-secret-key-32
IV: 1234567890abcdef
Plaintext: Hello ToolOrbit!

Output example

Ciphertext (Base64):
U2FsdGVkX19... (Base64-encoded encryption result; output differs per encryption)

Why use this symmetric crypto tool?

Browser-side experimentationTest AES-style encryption settings locally while learning how keys, modes, padding, and IV values affect the output.
Multiple algorithmsCompare modern and legacy symmetric algorithms for education, migration checks, or compatibility testing.
Clear security boundariesThe interface separates plaintext, ciphertext, keys, and parameters so reviewers can spot mistakes before reusing values.

Frequently Asked Questions

What is the difference between AES and DES?

AES is the modern standard for encryption, while DES (and TripleDES) are older and less secure.

What happens if I lose my key?

Symmetric encryption is irreversible without the specific key. If you lose it, the data cannot be recovered.

Are my keys sent to your server?

No. All encryption and decryption logic happens 100% in your browser using Crypto-JS libraries.