Trying to narrow down a bug. Found a post where the list renders as expected in edit preview, meaning both items have #. bullets, but when posted, they render inconsistently.

I have tried several different methods that give the same result, not suitable for me.

1)

    QMatrix4x4 mat = m_view * m_projection * m_model;

    QVector3D screenPos(p.x(),p.y(),1.0f);

s

t

a

i

r

s

This is a domain-relative link. And a tag: status-review

This is the first part of testing what happens when a post contains a domain-relative link and is transcluded.

SVG flowchart embedded in HTML in Snippet:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>

<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"

 "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">

<!-- Generated by graphviz version 9.0.0 (20230911.1827)

 -->

<!-- Title: G Pages: 1 -->

<svg width="531pt" height="456pt" viewBox="0.00 0.00 530.50 455.57" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">

<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 451.57)">

<title>G</title>

<polygon fill="white" stroke="none" points="-4,4 -4,-451.57 526.5,-451.57 526.5,4 -4,4"/>

<!-- Enter -->

<g id="node1" class="node">

<title>Enter</title>

<ellipse fill="black" stroke="black" stroke-width="1.2" cx="435.25" cy="-433.43" rx="60.63" ry="14.14"/>

<text text-anchor="start" x="400.38" y="-430.93" font-family="Georgia" font-weight="bold" font-size="10.00" fill="white">Start Process</text>

</g>

<!-- Htsrb -->

<g id="node2" class="node">

<title>Htsrb</title>

<polygon fill="#fff68f" stroke="black" stroke-width="1.2" points="435.25,-396.28 348,-352.28 435.25,-308.28 522.5,-352.28 435.25,-396.28"/>

<text text-anchor="middle" x="435.25" y="-360.78" font-family="Georgia" font-size="10.00">Check</text>

<text text-anchor="middle" x="435.25" y="-348.78" font-family="Georgia" font-size="10.00">Previous Script</text>

<text text-anchor="middle" x="435.25" y="-336.78" font-family="Georgia" font-size="10.00">Execution</text>

</g>

<!-- Enter&#45;&gt;Htsrb -->

<g id="edge1" class="edge">

<title>Enter&#45;&gt;Htsrb</title>

<path fill="none" stroke="black" stroke-width="2" d="M435.25,-419C435.25,-416.16 435.25,-413 435.25,-409.64"/>

<polygon fill="black" stroke="black" stroke-width="2" points="438.75,-409.86 435.25,-399.86 431.75,-409.86 438.75,-409.86"/>

</g>

<!-- Strfep -->

<g id="node9" class="node">

<title>Strfep</title>

<polygon fill="#bbffff" stroke="black" stroke-width="1.2" stroke-dasharray="5,2" points="491.25,-105.28 379.25,-105.28 379.25,-85.28 491.25,-85.28 491.25,-105.28"/>

<text text-anchor="middle" x="435.25" y="-91.78" font-family="Georgia" font-size="10.00">Update Last Position</text>

</g>

<!-- Htsrb&#45;&gt;Strfep -->

<g id="edge12" class="edge">

<title>Htsrb&#45;&gt;Strfep</title>

<path fill="none" stroke="red" stroke-width="2" d="M435.25,-307.81C435.25,-282.1 435.25,-254.78 435.25,-254.78 435.25,-254.78 435.25,-163.13 435.25,-118.78"/>

<polygon fill="red" stroke="red" stroke-width="2" points="438.75,-118.78 435.25,-108.78 431.75,-118.78 438.75,-118.78"/>

<text text-anchor="start" x="438.62" y="-247.23" font-family="Arial" font-weight="bold" font-size="9.00">First</text>

<text text-anchor="start" x="435.25" y="-238.23" font-family="Arial" font-weight="bold" font-size="9.00">Script</text>

<text text-anchor="start" x="439.75" y="-229.23" font-family="Arial" font-weight="bold" font-size="9.00">Run</text>

</g>

<!-- Hfsd -->

<g id="node3" class="node">

<title>Hfsd</title>

<polygon fill="#fff68f" stroke="black" stroke-width="1.2" points="69.25,-285.28 0,-241.28 69.25,-197.28 138.5,-241.28 69.25,-285.28"/>

<text text-anchor="middle" x="69.25" y="-249.78" font-family="Georgia" font-size="10.00">Check</text>

<text text-anchor="middle" x="69.25" y="-237.78" font-family="Georgia" font-size="10.00">for File Size</text>

<text text-anchor="middle" x="69.25" y="-225.78" font-family="Georgia" font-size="10.00">Decrease</text>

</g>

<!-- Hfsi -->

<g id="node4" class="node">

<title>Hfsi</title>

<polygon fill="#fff68f" stroke="black" stroke-width="1.2" points="69.25,-139.28 0,-95.28 69.25,-51.28 138.5,-95.28 69.25,-139.28"/>

<text text-anchor="middle" x="69.25" y="-103.78" font-family="Georgia" font-size="10.00">Check</text>

<text text-anchor="middle" x="69.25" y="-91.78" font-family="Georgia" font-size="10.00">for File Size</text>

<text text-anchor="middle" x="69.25" y="-79.78" font-family="Georgia" font-size="10.00">Increase</text>

</g>

<!-- Hfsd&#45;&gt;Hfsi -->

<g id="edge11" class="edge">

<title>Hfsd&#45;&gt;Hfsi</title>

<path fill="none" stroke="green" stroke-width="2" d="M69.25,-197.08C69.25,-182.98 69.25,-167.12 69.25,-152.23"/>

<polygon fill="green" stroke="green" stroke-width="2" points="72.75,-152.49 69.25,-142.49 65.75,-152.49 72.75,-152.49"/>

<text text-anchor="start" x="89.88" y="-178.73" font-family="Arial" font-weight="bold" font-size="9.00">File</text>

<text text-anchor="start" x="88.75" y="-169.73" font-family="Arial" font-weight="bold" font-size="9.00">Has</text>

<text text-anchor="start" x="89.88" y="-160.73" font-family="Arial" font-weight="bold" font-size="9.00">Not</text>

<text text-anchor="start" x="69.25" y="-151.73" font-family="Arial" font-weight="bold" font-size="9.00"> &#160;&#160;&#160;Decreased</text>

</g>

<!-- MtS -->

<g id="node6" class="node">

<title>MtS</title>

<polygon fill="#bbffff" stroke="black" stroke-width="1.2" points="365.5,-251.28 279,-251.28 279,-231.28 365.5,-231.28 365.5,-251.28"/>

<text text-anchor="middle" x="322.25" y="-237.78" font-family="Georgia" font-size="10.00">Set to File Start</text>

</g>

<!-- Hfsd&#45;&gt;MtS -->

<g id="edge14" class="edge">

<title>Hfsd&#45;&gt;MtS</title>

<path fill="none" stroke="red" stroke-width="2" d="M139.39,-241.28C179.29,-241.28 228.59,-241.28 265.94,-241.28"/>

<polygon fill="red" stroke="red" stroke-width="2" points="265.59,-244.78 275.59,-241.28 265.59,-237.78 265.59,-244.78"/>

<text text-anchor="start" x="167.12" y="-247.98" font-family="Arial" font-weight="bold" font-size="9.00">File Size Decreased</text>

</g>

<!-- MtLP -->

<g id="node7" class="node">

<title>MtLP</title>

<polygon fill="#bbffff" stroke="black" stroke-width="1.2" points="265.25,-117.28 195.25,-117.28 195.25,-73.28 265.25,-73.28 265.25,-117.28"/>

<text text-anchor="middle" x="230.25" y="-103.78" font-family="Georgia" font-size="10.00">Go to</text>

<text text-anchor="middle" x="230.25" y="-91.78" font-family="Georgia" font-size="10.00">Last Known</text>

<text text-anchor="middle" x="230.25" y="-79.78" font-family="Georgia" font-size="10.00">Position</text>

</g>

<!-- Hfsi&#45;&gt;MtLP -->

<g id="edge10" class="edge">

<title>Hfsi&#45;&gt;MtLP</title>

<path fill="none" stroke="green" stroke-width="2" d="M139.4,-95.28C153.76,-95.28 168.57,-95.28 181.96,-95.28"/>

<polygon fill="green" stroke="green" stroke-width="2" points="181.78,-98.78 191.78,-95.28 181.78,-91.78 181.78,-98.78"/>

<text text-anchor="start" x="159.75" y="-117.73" font-family="Arial" font-weight="bold" font-size="9.00">File</text>

<text text-anchor="start" x="157.88" y="-108.73" font-family="Arial" font-weight="bold" font-size="9.00">Size</text>

<text text-anchor="start" x="145.5" y="-99.73" font-family="Arial" font-weight="bold" font-size="9.00">Increased</text>

</g>

<!-- Left -->

<g id="node11" class="node">

<title>Left</title>

</g>

<!-- Hfsi&#45;&gt;Left -->

<g id="edge6" class="edge">

<title>Hfsi&#45;&gt;Left</title>

<path fill="none" stroke="red" stroke-width="2" d="M69.25,-51.01C69.25,-32.53 69.25,-15.14 69.25,-15.14"/>

</g>

<!-- GrvLP -->

<g id="node5" class="node">

<title>GrvLP</title>

<polygon fill="#bbffff" stroke="black" stroke-width="1.2" points="128.25,-362.28 10.25,-362.28 10.25,-342.28 128.25,-342.28 128.25,-362.28"/>

<text text-anchor="middle" x="69.25" y="-348.78" font-family="Georgia" font-size="10.00">Retrieve Last Position</text>

</g>

<!-- GrvLP&#45;&gt;Htsrb -->

<g id="edge9" class="edge">

<title>GrvLP&#45;&gt;Htsrb</title>

<path fill="none" stroke="green" stroke-width="2" d="M141.41,-352.28C200.41,-352.28 284.09,-352.28 347.07,-352.28"/>

<polygon fill="green" stroke="green" stroke-width="2" points="141.49,-348.78 131.49,-352.28 141.49,-355.78 141.49,-348.78"/>

<text text-anchor="start" x="191.25" y="-358.98" font-family="Arial" font-weight="bold" font-size="9.00">Script Has Run Before</text>

</g>

<!-- GrvLP&#45;&gt;Hfsd -->

<g id="edge2" class="edge">

<title>GrvLP&#45;&gt;Hfsd</title>

<path fill="none" stroke="black" stroke-width="2" d="M69.25,-341.99C69.25,-332.06 69.25,-315.47 69.25,-298.64"/>

<polygon fill="black" stroke="black" stroke-width="2" points="72.75,-298.86 69.25,-288.86 65.75,-298.86 72.75,-298.86"/>

</g>

<!-- RtE -->

<g id="node8" class="node">

<title>RtE</title>

<polygon fill="#bbffff" stroke="black" stroke-width="1.2" stroke-dasharray="5,2" points="352,-117.28 292.5,-117.28 292.5,-73.28 352,-73.28 352,-117.28"/>

<text text-anchor="middle" x="322.25" y="-103.78" font-family="Georgia" font-size="10.00">Read</text>

<text text-anchor="middle" x="322.25" y="-91.78" font-family="Georgia" font-size="10.00">New Data</text>

<text text-anchor="middle" x="322.25" y="-79.78" font-family="Georgia" font-size="10.00">to End</text>

</g>

<!-- MtS&#45;&gt;RtE -->

<g id="edge4" class="edge">

<title>MtS&#45;&gt;RtE</title>

<path fill="none" stroke="black" stroke-width="2" d="M322.25,-230.84C322.25,-210.76 322.25,-163.02 322.25,-130.16"/>

<polygon fill="black" stroke="black" stroke-width="2" points="325.75,-130.57 322.25,-120.57 318.75,-130.57 325.75,-130.57"/>

</g>

<!-- MtLP&#45;&gt;RtE -->

<g id="edge3" class="edge">

<title>MtLP&#45;&gt;RtE</title>

<path fill="none" stroke="black" stroke-width="2" d="M265.47,-95.28C270.04,-95.28 274.62,-95.28 279.19,-95.28"/>

<polygon fill="black" stroke="black" stroke-width="2" points="279.06,-98.78 289.06,-95.28 279.06,-91.78 279.06,-98.78"/>

</g>

<!-- RtE&#45;&gt;Strfep -->

<g id="edge5" class="edge">

<title>RtE&#45;&gt;Strfep</title>

<path fill="none" stroke="black" stroke-width="2" d="M352.27,-95.28C356.83,-95.28 361.4,-95.28 365.97,-95.28"/>

<polygon fill="black" stroke="black" stroke-width="2" points="365.82,-98.78 375.82,-95.28 365.82,-91.78 365.82,-98.78"/>

</g>

<!-- Right -->

<g id="node12" class="node">

<title>Right</title>

</g>

<!-- Strfep&#45;&gt;Right -->

<g id="edge7" class="edge">

<title>Strfep&#45;&gt;Right</title>

<path fill="none" stroke="black" stroke-width="2" d="M435.25,-84.89C435.25,-63.93 435.25,-15.14 435.25,-15.14"/>

</g>

<!-- Exit -->

<g id="node10" class="node">

<title>Exit</title>

<ellipse fill="black" stroke="black" stroke-width="1.2" cx="269.25" cy="-14.14" rx="57.45" ry="14.14"/>

<text text-anchor="start" x="236.62" y="-11.64" font-family="Georgia" font-weight="bold" font-size="10.00" fill="white">End Process</text>

</g>

<!-- Exit&#45;&gt;Right -->

<g id="edge8" class="edge">

<title>Exit&#45;&gt;Right</title>

<path fill="none" stroke="black" stroke-width="2" d="M339.65,-14.14C371.52,-14.14 403.38,-14.14 435.25,-14.14"/>

<polygon fill="black" stroke="black" stroke-width="2" points="339.99,-10.64 329.99,-14.14 339.99,-17.64 339.99,-10.64"/>

</g>

<!-- Left&#45;&gt;Exit -->

<g id="edge13" class="edge">

<title>Left&#45;&gt;Exit</title>

<path fill="none" stroke="red" stroke-width="2" d="M69.25,-14.14C69.25,-14.14 141.06,-14.14 198.62,-14.14"/>

<polygon fill="red" stroke="red" stroke-width="2" points="198.37,-17.64 208.37,-14.14 198.37,-10.64 198.37,-17.64"/>

<text text-anchor="start" x="146.9" y="-36.59" font-family="Arial" font-weight="bold" font-size="9.00">File</text>

<text text-anchor="start" x="145.4" y="-27.59" font-family="Arial" font-weight="bold" font-size="9.00">size</text>

<text text-anchor="start" x="130.4" y="-18.59" font-family="Arial" font-weight="bold" font-size="9.00">unchanged</text>

</g>

</g>

</svg>

Formatting Sandbox

ACE does not work on Stack Exchange, because if it did you would have seen a browser alert.

<b>Test</b> t`e`st `test`

Testing the rendering of a link, related to Square brackets in hyperlinks is broken in comments.

[[class.access](http://eel.is/c++draft/class.access)]

[class.access]

Testing rendering of some more links, related to Diamonds (♦) break the automatic hyperlink parser.

• My question was deleted by Community♦
• Community ♦ should discriminate more when bumping unanswered questions
• Users who can't write good posts ≠ users who want to write good posts

Testing image sizes Why huge images?

trying to make a copy button for my markdown

function test() {
  console.log("This code will have a copy button to the right of it");
}

<sub>
test _hello_ test - newline at start and end
</sub>

<sub> test _hello_ test - oneline</sub>

_{test hello test - oneline}

<sub>
test _hello_ test - newline at start</sub>

<sub>test _hello_ test - newline at end
</sub>

_{test hello test - newline at end}

Create Markdown from T-SQL?

https://www.sqlservercentral.com/articles/creating-markdown-formatted-text-for-results-from-sql-server-tables

From Excel

https://davetallett26.github.io/excel-markdown.html

Excel > Data > Get Data > From Database > From SQL Server database

From T-SQL

USE [TestMD]
GO
/****** Object:  StoredProcedure [dbo].[Select2MD]    Script Date: 27/03/2024 07:50:32 ******/
SET ANSI_DEFAULTS ON
GO
ALTER PROCEDURE [dbo].[Select2MD]
/*
Author: Tomaz Kastrun and David Tallett
Date: 26.Mar.2024
Description: Turns result set of selected table into Markdown suitable for use on StackOverflow
Usage:
        EXEC dbo.select2MD
                @table_name = 'TestForMD'
               ,@schema_name = 'dbo'

        DECLARE @text NVARCHAR(100)
        SET @text = 'This is line 1.' + CHAR(13) + 'This is line 2.'
        SELECT @text

stackoverflow.com/questions/31057/how-to-insert-a-line-break-in-a-sql-server-varchar-nvarchar-string

Tools > Options > Query Results > SQL Server > Results to Grid > Retain CR/LF on copy or save
SQL Server Management Studio                        19.3.4.0

ToDO:
*/    @table_name VARCHAR(200)
     ,@schema_name VARCHAR(20)
AS 
BEGIN
        SET NOCOUNT ON;
    -- get the columns of the table
        SELECT 
            c.Column_name
            ,c.Ordinal_position
            ,c.is_nullable
            ,c.Data_Type
        
        INTO  #temp
        
        FROM INFORMATION_SCHEMA.TABLES AS  t
        JOIN INFORMATION_SCHEMA.COLUMNS AS c 
        ON t.table_name = c.table_name
        AND t.table_schema = c.table_schema
        AND t.table_Catalog = c.table_Catalog
        WHERE
        t.table_type = 'BASE TABLE'
        AND t.Table_name = @table_name
        AND t.table_schema = @schema_name

            DECLARE @MD NVARCHAR(MAX)

            -- header | name | name2 | name3 | name4 | name5 | name6 
            DECLARE @header VARCHAR(MAX)
            SELECT @header = COALESCE(@header + ' | ','') + column_name 
            FROM #temp
            ORDER BY Ordinal_position ASC
            SELECT @header = ' | ' + @header + ' | '

            -- delimiter | --- | --- | --- | --- | --- | --- 
            DECLARE @nof_columns INT = (SELECT MAX(Ordinal_position) FROM #temp)
            DECLARE @firstLine NVARCHAR(MAX) = (SELECT  REPLICATE('| --- ',@nof_columns) + '|')  
            SET @MD = @header + CHAR(13) + CHAR(10) + CHAR(32) + @firstLine + CHAR(13) + CHAR(10)

            -- body
            DECLARE @body_sql NVARCHAR(MAX)
            SET @body_sql = 'SELECT
            ''| '' + CAST(' 
            DECLARE @i INT = 1
            WHILE @i <= @nof_columns
            BEGIN
                DECLARE @w VARCHAR(1000) =  (SELECT column_name FROM #temp WHERE Ordinal_position = @i)
                    SET @body_sql = @body_sql + @w + ' AS VARCHAR(MAX))+ '' | '' + CAST( '
                SET @i = @i + 1
            END
            SET @body_sql  = (SELECT SUBSTRING(@body_sql,1, LEN(@body_sql)-8))
            SET @body_sql = @body_sql + ' FROM ' + @table_name

            DECLARE @bodyTable TABLE(MD VARCHAR(MAX))
            INSERT INTO @BodyTable
            EXEC sp_executesql @body_sql

            DECLARE @body2 NVARCHAR(MAX)
            SELECT @body2 = COALESCE(@body2 + ' ', ' ') + MD + CHAR(13) + CHAR(10) 
            FROM @bodyTable
            SET @MD = @MD + @body2
          
            SELECT @MD
END;

Testing whitespace in inline code formatting. (Seems to render different in the preview.) Edit: Confirmed, whitespace at the start of a line gets stripped, but not in preview.

Original

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: cannot import name 'foo' from 'gi' (/usr/lib/python3/dist-packages/gi/__init__.py)

Inline formatted

Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: cannot import name 'foo' from 'gi' (/usr/lib/python3/dist-packages/gi/__init__.py)

How that previews (preformatted):

Traceback (most recent call last):   File "<stdin>", line 1, in <module> ImportError: cannot import name 'foo' from 'gi' (/usr/lib/python3/dist-packages/gi/__init__.py)

Newlines replaced with spaces, inline formatted

Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: cannot import name 'foo' from 'gi' (/usr/lib/python3/dist-packages/gi/__init__.py)

How that previews (preformatted):

Traceback (most recent call last):   File "<stdin>", line 1, in <module> ImportError: cannot import name 'foo' from 'gi' (/usr/lib/python3/dist-packages/gi/__init__.py)

Let's try to play with code snippets...

$("#fade-toggle").click(() => {
  $("p").fadeToggle();
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<button id="fade-toggle">Show/Hide</button>
<br>
<p>text</p>

It worked. Maybe I can use ReactJS?

function MyForm() {
  return (
    <div>
      <form>
        <label>Enter your name:
          <input type="text" />
        </label>
      </form>
    </div>
  )
}

const root = ReactDOM.unstable_createRoot(document.getElementById('root'));
root.render(<MyForm />);

<div id="root"></div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>

It actually works, you just have to use Babel and create a root element.

note to self: This sandbox is probably best for further reading/ comment overflow etc.. https://chat.stackoverflow.com/ seems more for -- chat.

Test whether links to Sandbox answers break on archival, created [2024-07-15]: Formatting Sandbox

Tests

https://meta.stackexchange.com/a/401417/164541
https://meta.stackexchange.com/a/401417

https://meta.stackexchange.com/q/68957/164541   
https://meta.stackexchange.com/q/68957   
https://meta.stackexchange.com/questions/68957/manually-clear-saved-question-drafts/401417#answer-401417  
https://meta.stackexchange.com/questions/68957/manually-clear-saved-question-drafts/401417  
https://meta.stackexchange.com/questions/68957/manually-clear-saved-question-drafts

↓
Manually clear saved question drafts
Manually clear saved question drafts
Manually clear saved question drafts
Manually clear saved question drafts
Manually clear saved question drafts

• None of these get replaced in comments.

С#:

public string X {get; set;}

default:

public string X {get; set;}

testing testing

testing testing

this post is so not by Stormblessed it’s just incredible how written-by-a-different-person it is (this is going to be for a bug report)

Hi this is a person who is very non-blessed-by-the-storms.

.bold text after a dot works in answers

.it can also be done using HTML tags

<$ ‮ !oboRhceTehT m'I ,iH

Try editing the above sentence post to say something else (but dont remove the <$), you'll have nightmares >:)

Hi I keep seeing posts that start with "hi" so I want to check to see if "hi" still gets removed.

Apparently "Hi," or "Hi everyone," gets removed, but just "Hi" without the comma doesn't.

Testing highlighted text links

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi eget nunc sed dui ullamcorper suscipit sit amet vitae arcu. Donec egestas dolor vitae pretium consectetur. Mauris consequat, purus eu dignissim feugiat, dui massa venenatis felis, ut luctus felis felis id nunc. Fusce tristique ultrices mauris bibendum finibus. In hac habitasse platea dictumst. Proin facilisis odio vel vulputate euismod. Quisque finibus a libero eu pulvinar. Aliquam porta urna non neque laoreet, vel malesuada libero efficitur. Donec consectetur tellus in nunc auctor, id feugiat sapien pretium. Sed at metus dui. Sed ipsum metus, interdum nec erat et, tempor feugiat dui. Integer rutrum.

An answer to the question

In line code span may be nice

function dummy() {
    p1=$1
    printf "Dummy gets $p1"
}

• How to
  This way
  Besides that way is ok, the other way is quite better
• Whith what?
  With this and that
• When?
  Right now

And as Zaratustra in Ein Buch für Alle und Keinen said...

Nicht reden einmal will ich wieder mit dem Volke; zum letzten Male sprach ich zu einem Todten

crystal clear

Some other matters

I love linux and I accept windows...and doors as well

Working code in this rextester

Naming

Standards

Why do you use x in your for loop when the standard is i?

Inconsistencies

You use the name repeatLoop for one function but sdl_bindings for a class.

Your use of goto makes this code very unreadable

Look up Goto considered harmful

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Disadvantages:

• Message length In Cryptography, usually, the message length is not considered secret. There are approaches that you can add random values to the end or beginning or both if this is really an information leak for you. The random approach depends on your actual data case...

• The (IV, key) pair reuse problem that can eliminate the confidentiality with the crib-dragging technique.

• Lack of authentication Like all unauthenticated encryption modes, the bare CTR mode lacks integrity and authentication. A single bit of flipping can have catastrophic results. The AES-GCM mode that used the CTR mode of operation provides you all-in-once, however, it has the same (IV, key) pair reuse problem. There is a Synthetic Initialization Vector (SIV) mode as nonce-misuse resistance ( paper, rfc8452 ) that eliminates this.

• Long message distinguisher: The CTR mode is designed with a Pseudo-Random-Function (PRF). When using AES in CTR mode, we use it with Pseudo Random Permutation (PRP); $$E_k\colon {0,1}^n \to {0,1}^n.$$ Whit PRP as long as the message blocks are not repeated the sequence $E_k(0), E_k(1), \dots, E_k(\ell - 1)$ with $\ell < 2^n$ is not repeated. If the message with length $\ell$-block has no repeated block this is no problem. If we approach the message as uniform random block then we expect a collision $\ell \approx \sqrt{2^n} = 2^{n/2}$ by the birthday paradox/attack.

  When used with AES-128 for long messages check for the repeat. The repeat enables the attacker to distinguish this from uniform random with non-negligible probability.

  In short, a duplicate ciphertext leaks that the messages are different.

Other advantages:

1. No need the decryption: Doesn't require decryption of the block cipher. This is very helpful in constraint environments. Simplifies the software and hardware code, too.

2. No need PRP: Doesn't need a block cipher (PRP) at all. A hash function can be used like in the ChaCha series.

3. Prepocessing: the keystream generated by the CTR mode can be prepared before. This can help to use buffers.

A little history of CTR

CTR mode was introduced by Whitfield Diffie and Martin Hellman in 1979

• Privacy and Authentication: An Introduction to Cryptography as an invited paper on Proceedings of the IEEE, 67 (1979), pp. 397–427.

• A concrete Security of Treatment of Symmetric Encryption, Bellare et. al, 97

• See also; Comments to NIST concerning AES Modes of Operations: CTR-Mode Encryption, by Lipmaa et al.

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