How Cryptic Password Generator Works
The Problem
People need unique, strong passwords for every website, but remembering dozens of different passwords is impractical. Common workarounds — reusing the same password, writing them down, or using simple variations — all compromise security.
The Solution
Cryptic Password Generator takes a different approach: instead of storing passwords, it derives them deterministically. You remember one master password, and the tool computes a unique password for each site on the fly. The same inputs always produce the same output, so there is nothing to store or sync.
How It Works
The generation follows a simple formula:
password = MD5(masterPassword + ":" + siteName)Step by Step
- Input: The user provides a master password and a site name (e.g.,
amazon.com). - Normalize the site name: If a full URL is entered (e.g.,
https://www.amazon.com/some/path), the tool extracts the base domain (amazon.com). This ensures the same password is generated regardless of which page on the site the user is visiting. - Concatenate: The master password and site name are joined with a colon separator —
masterPassword:amazon.com. - Hash with MD5: The concatenated string is passed through the MD5 hashing algorithm (RFC 1321), producing a 32-character hexadecimal string.
- Truncate: The hash is truncated to the user-specified length (default 8 characters).
- Transform case: Depending on the user's choice, the hex letters (a–f) in the output are converted to lower case, upper case, or mixed case (alternating).
- Add prefix/suffix: If the user has specified a prefix or suffix (e.g.,
A#and!9), these are prepended and appended to the hash portion, producing the final password.
Example
| Input | Value |
|---|---|
| Master password | correct horse |
| Site name | amazon.com |
| Length | 8 |
| Case | Mixed |
| Prefix | A# |
| Suffix | !9 |
The tool computes MD5("correct horse:amazon.com"), takes the first 8 characters, applies mixed case, and wraps it with the prefix and suffix. The result might look like: A#1A2b3C4d!9.
Changing any input — even a single character in the master password or a different site name — produces a completely different output.
Why This Is Useful
One password to remember
You only need to memorize your master password. Every site gets its own unique password derived from it.
Nothing to store or steal
Unlike a password vault, there is no encrypted database that could be breached, lost, or corrupted. The passwords exist only at the moment they are generated.
Deterministic and portable
The same inputs always produce the same output. You can use the tool on any device without syncing anything — just enter your master password and site name.
Unique per site
A breach at one website reveals nothing about your passwords on other sites, because each site produces a completely different hash.
Client-side only
The master password never leaves the browser. All computation happens in JavaScript on your device. The server never sees, transmits, or stores your master password.
Customizable for site requirements
The prefix and suffix fields allow you to satisfy site-specific password policies (e.g., must contain a special character, must start with a capital letter) without changing the core hash. Registered users can save these settings per site for convenience.
Limitations
- MD5 is not a modern key derivation function. It is fast to compute, which means brute-force attacks against a known hash are feasible. However, an attacker would need both the generated password and knowledge of the scheme to attempt this.
- Changing your master password changes all passwords. There is no way to rotate a single site's password independently (though the prefix/suffix fields provide a workaround).
- No password history. If you forget what settings you used for a site, you must try to reconstruct them. Registered users can mitigate this by saving site profiles.