Cryptan offers three ways to use the service: Cryptan Web, Cryptan Desktop, and Cryptan Easy Decription.
Please use the service that best suits your environment and policies.
4Login require registration as 4Login Dev Supporter (JPY 220 per month, tax included).
Web version
Cryptan Web
This is a web-based encryption and decryption service supporting post-quantum cryptography (PQC) that can be easily used via a browser without requiring installation.
Recommended for
- First-time users of encryption
- No installation required—easily get started right from your browser
- Includes a feature to prevent decryption of shared encrypted files
Includes post-quantum cryptography (PQC) support
*To use this service, you must join the 4Login Dev Supporter.
What You’ll Need
4Login App
Desktop version
Cryptan Desktop
File encryption and decryption service supporting post-quantum cryptography (PQC)
No file size limits! This Windows software is safe and easy to use.
Recommended for
- For those who want to encrypt or decrypt files larger than 30MB
- Since encryption is performed on your local PC, processing is completed quickly
- Virus scan feature available when decrypting encrypted files
Includes post-quantum cryptography (PQC) support
*To use this service, you must join the 4Login Dev Supporter.
What You’ll Need
4Login App
Cryptan Desktop Software
p4c File Decryption-Only Version
Cryptan Easy Decription
A web service dedicated to decrypting “p4c files” for anyone who simply wants to decrypt them.
Recommended for
- For those who only want to decrypt p4c files
- Available simply by accessing the website (no login required)
- Decrypt using only your email address
What You’ll Need
・Email Address
Basic Information
| Web Version | Desktop Version | Cryptan Easy Decription | |
|---|---|---|---|
| Service Type | Web Service | Windows software | Web Service |
| Price | Free to use Some features require registration as a “Development Supporter.” | Free to use Some features require registration as a “Development Supporter.” | Free |
| Account Registration for the “4Login” Smartphone App | Required | Required | Not Required |
| Installation of the Cryptan Desktop Software | Not Required | Required | Not Required |
| Login using 4Login | Required | Required ※*When starting to use service | Not Required |
| Sending and receiving files to/from the server | Yes | n/a | Yes |
| Supported Languages | Japanese / English | Japanese / English | Japanese / English |
Feature Comparison Table
| Cryptan Web | Cryptan Desktop | |
|---|---|---|
| File Encryption – RSA | One file per session (up to 30 MB) | Multiple files allowed (no size limit) |
| File Encryption – ML-KEM: PQC (Post-Quantum Cryptography) | One file per session (up to 30 MB) | Multiple files allowed (no size limit) |
| Decryption of Encrypted Files – RSA | One file per session (up to 30 MB) | Multiple files allowed (no size limit) |
| Decryption of Encrypted Files – ML-KEM: PQC (Post-Quantum Cryptography) | One file per session (up to 30 MB) | Multiple files allowed (no size limit) |
| Authentication Method | Tap Authentication (Matrix Method + Login Protection) | Tap Authentication (Matrix Method + Login Protection) |
| Encryption History | ー | |
| Decryption History | ー | |
| Decryption Period Settings | 7 days Selectable from 7, 15, 30, 60, or 90 days | 7 days Selectable from 7, 15, 30, 60, or 90 days |
| Group Features | Import and selection only | |
| Number of Group Settings | Up to 10 Up to 20 | ー |
| Public Group Feature | Import and selection only | |
| Prohibit Decryption After Encrypted File Sharing | ー | |
| Editing the Decryption Allow List After Encrypted File Sharing | ー | |
| Editing the Decryption Denial List After Encrypted File Sharing | ー | |
| Virus Scan During Decryption | ー | |
| Specifying Folders for Encryption and Decryption | ー | |
| Automatically Attaching Encrypted Files to Emails | ー |
: Development Supporter Features
| Cryptan Easy Decription | |
| Decrypting Encrypted Files (.p4c) – RSA | *The following file formats are not supported* .pqc / .pqcx / .p4cx |
| Authentication Method | Email Address Authentication |