About PRESENT Decryption Tool
PRESENT is an ultra-lightweight block cipher designed for constrained environments such as RFID tags and sensor networks. It operates on 64-bit blocks and supports 80-bit or 128-bit keys with 31 rounds. Standardised in ISO/IEC 29192-2:2019. When using CBC mode, the PKCS#7 padding scheme is used.
Input: text. Output: text.
Format reference: PRESENT 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 | {"string":"ffffffffffffffffffff","option":"Hex"} | Key/text encoding: Hex, UTF8, Latin1, Base64 |
| IV | {"string":"","option":"Hex"} | Key/text encoding: Hex, UTF8, Latin1, Base64 |
| Mode | ECB | CBC, 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
3333dcd3213210d2
Result
ffffffffffffffff
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, 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.