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How to Use AES-CTR Encrypt/Decrypt Tool

Use fixed CTR mode encryption/decryption for compatibility workflows and structured key/IV handling.

Step 1

Choose Encrypt or Decrypt

Select the operation in the middle panel. CTR mode is stream-like and often used in interoperability workflows defined by NIST SP 800-38A:

Use Encrypt for plaintext input.
Use Decrypt for Base64 ciphertext input.
Cipher mode is fixed to CTR.

Example: Plaintext

{"session":"S-7782","scope":"read:billing","exp":1735689600}
Step 2

Set Key and IV

Provide hex key and IV values or use the regenerate control. For secure values, rely on crypto.getRandomValues and verify key length matches AES-128 or AES-256.

AES-128 key length: 32 hex chars.
AES-256 key length: 64 hex chars.
IV length: 32 hex chars (16 bytes).

Example: Key/Counter

key(hex): 00112233445566778899aabbccddeeff00112233445566778899aabbccddeeff
ctr(hex): ffeeddccbbaa99887766554433221100
Step 3

Copy or Download Result

Use the right panel output for API calls, config values, or secure transfer.

Copy output directly to clipboard.
Download output as `.txt` file.
For generic AES tools, use AES Encryption and AES Decryption.
Step 4

Validate Counter and Output Encoding

Counter/nonce handling must match your target library exactly. Ensure Base64 output handling aligns with RFC 4648 and storage follows OWASP recommendations.

Example: CTR Ciphertext

m3D0V2WQO5p0aTIbP+UJtxR9I3hV7J3sojKCY5W4x7k4p8EQ2jQ=

Frequently Asked Questions

When should I use AES-CTR?

AES-CTR is useful when you need compatibility with systems that specifically require CTR mode.

Is this tool browser-side?

Yes. Encryption and decryption run in your browser using Web Crypto APIs.

Why does decryption fail?

AES-CTR decryption fails if key, IV, AES mode, or ciphertext does not match exactly.

Can I use generated key/IV from this page elsewhere?

Yes. You can use the same key/IV values in your backend services or other cryptography tools that support AES-CTR.

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