About TEA Decryption Tool
TEA (Tiny Encryption Algorithm) is a block cipher designed by David Wheeler and Roger Needham in 1994. It operates on 64-bit blocks using a 128-bit key and performs 32 cycles (64 Feistel rounds) with the DELTA constant 0x9E3779B9 derived from the golden ratio. TEA is notable for its simplicity and compact implementation, making it frequently encountered in malware analysis and CTF challenges. Despite its elegance, TEA has known weaknesses including equivalent keys and susceptibility to related-key attacks, leading to successors XTEA and XXTEA. Key: Must be exactly 16 bytes (128 bits). IV: The Initialisation Vector should be 8 bytes (64 bits). If not entered, it will default to null bytes. Padding: In CBC and ECB mode, the PKCS#5 padding scheme is used.
Input: text. Output: text.
Format reference: TEA Decrypt background and specification
Example
Use “Try example” to load this public sample and its settings, then run it.
Settings used in this example
| Parameter | Example value | Input and choices |
|---|---|---|
| Key | {"option":"Hex","string":"00000000000000000000000000000000"} | Key/text encoding: Hex, UTF8, Latin1, Base64 |
| IV | {"option":"Hex","string":""} | Key/text encoding: Hex, UTF8, Latin1, Base64 |
| Mode | ECB | CBC, CFB, OFB, CTR, ECB |
| Input | Hex | Hex, Raw |
| Output | Hex | Raw, Hex |
| Padding | NO | PKCS5, NO, ZERO, RANDOM, BIT |
Sample keys and passwords are public. Never use them to protect real data.
Input
41ea3a0a94baa940
Result
0000000000000000
Parameters
| Parameter | Default value | Input and choices |
|---|---|---|
| Key | {"option":"Hex","string":""} | Key/text encoding: Hex, UTF8, Latin1, Base64 |
| IV | {"option":"Hex","string":""} | Key/text encoding: Hex, UTF8, Latin1, Base64 |
| Mode | CBC | CBC, CFB, OFB, CTR, ECB |
| Input | Hex | Hex, Raw |
| Output | Raw | Raw, Hex |
| Padding | PKCS5 | PKCS5, NO, ZERO, RANDOM, BIT |
Before interpreting the result
Use the exact key encoding, mode, padding and IV expected by the source system. Historical ciphers are useful for learning and analysis. Encoding alone provides no confidentiality.
How to use this page
- Paste your input or open a local file.
- Adjust tool options if needed, then choose Run tool.
- Copy the result or download the original output bytes.
Inputs and results are not added to the public catalogue or saved in the URL. Processing happens in your browser; HTTP Request and DNS over HTTPS send the requests you explicitly run. Files up to 128 MiB can be opened; decompression and image tools may have smaller processing limits. Large results have a shortened preview. Text and HTML downloads use UTF-8; binary downloads preserve output bytes. Pasted text follows browser newline handling; open a file when exact input bytes matter.