---
title: "QL-Crypt File Encoder"
type: "article"
slug: "ql-crypt-file-encoder"
url: "http://localhost/article/ql-crypt-file-encoder/"
markdown_url: "http://localhost/article/ql-crypt-file-encoder.md"
published_at: "2026-03-15T00:13:47+00:00"
modified_at: "2026-03-15T00:13:47+00:00"
featured_image:
  url: "http://localhost/wp-content/uploads/2022/04/20230809-041332.jpg"
excerpt: "A QL SuperBASIC utility for encrypting and decrypting Sinclair ASCII text files using a password. The password is hashed to seed a pseudo-random number generator; each character's ASCII value is offset by a random 1–4 value. The same seed and process allows decryption with the correct password. Includes full listing with Encode, Decode, and Instructions…"
category:
  - name: "Timelinez"
    slug: "timelinez"
    taxonomy: "category"
    url: "http://localhost/category/periodicals/timelinez/"
post_tag:
  - name: "QL"
    slug: "ql"
    taxonomy: "post_tag"
    url: "http://localhost/tag/ql/"
  - name: "Superbasic (programming language)"
    slug: "superbasic-programming-language"
    taxonomy: "post_tag"
    url: "http://localhost/tag/superbasic-programming-language/"
  - name: "Type-in program"
    slug: "type-in-program"
    taxonomy: "post_tag"
    url: "http://localhost/tag/type-in-program/"
model:
  - name: "Sinclair QL"
    slug: "sinclair-ql"
    taxonomy: "model"
    url: "http://localhost/model/sinclair-ql/"
indiv:
  - name: "Tim Swenson"
    slug: "tim-swenson"
    taxonomy: "indiv"
    url: "http://localhost/indiv/tim-swenson/"
publication_r:
  id: 21571
  title: "Timelinez"
  type: "periodical"
  url: "http://localhost/periodical/timelinez/"
authors_r:
  - name: "Tim Swenson"
    slug: "tim-swenson"
    taxonomy: "indiv"
    url: "http://localhost/indiv/tim-swenson/"
volume: "5"
issue: "6"
issues_articles:
  - id: 38855
    title: "Timelinez v5 n6"
    type: "issue"
    url: "http://localhost/issue/timelinez-v5-n6/"
pages: "5"
pubdate: "June 1987"
archive_link: false
---

# QL-Crypt File Encoder

A QL SuperBASIC utility for encrypting and decrypting Sinclair ASCII text files using a password. The password is hashed to seed a pseudo-random number generator; each character’s ASCII value is offset by a random 1–4 value. The same seed and process allows decryption with the correct password. Includes full listing with Encode, Decode, and Instructions modes.