Editing 3054: Scream Cipher

{{comic
| number    = 3054
| date      = February 21, 2025
| title     = Scream Cipher
| image     = scream_cipher_2x.png
| imagesize = 287x416px
| noexpand  = true
| titletext = AAAAAA A ÃA̧AȂA̦ ǍÅÂÃĀÁȂ AAAAAAA!
}}

==Explanation==
{{incomplete|Created by A ÃA̧ȂÁAǍẢÂA̋ ȦÅĀ - Please change this comment when editing this page. Do NOT delete this tag too soon.}}
A {{w|Cipher}} is a method of encryption, where characters or sometimes words are substituted for other characters in a set pattern, allowing for arbitrary strings to be enciphered using it. The complexity and strength of ciphers varies, from {{w|one-time pads}} and (historically) {{w|enigma machine|Enigma}} as stronger and more complex, to {{w|substitution ciphers}} as some of the weakest and least complex, where each character is simply given a set different symbol to represent it in the cipher.

This comic uses a substitution cipher, where all the letters of the English Alphabet are represented using the letter "A", with different {{w|diacritical marks}} to define the differences. This kind of cipher is often used on a recreational basis by children or casual enthusiasts, the similarity of the letters increasing the obcurity of the content and the skill or technology required for use, but there is also significant impracticality, as not only are substitution ciphers the easiest to break, but also the similarities in the letters do make the cipher hard to read and easy to misread, and the detail in the diacritical marks makes it easy to draw the "A"s incorrectly or ambiguously, potentially leading to [[3003: Sandwich Helix|part of the message being lost]]. This was our experience in the comments section of this very article, where one person implemented translator functions alongside another person crafting a message that failed to translate. However, the logic behind the code is mostly visual similarity, and if attentive to connecting concepts between the American and scream cipher alphabet, it could be quickly learned and translated in a glance.

It's named "Scream Cipher" (as a pun on {{w|stream cipher}}s, commonly used in computing) because the written form of a scream is a long string of As, possibly with some other characters at the end (and often an exclamation point for emphasis), such as "Aaaaaah!" or "Aaaaaaagh!". The name may or may not be a reference to IBM's {{w|Scream_(cipher)|Scream cipher}} published in 2002.

In the comic, [[Cueball]] texts the ciphered version for the plaintext "HELLO", and [[Megan]] responds with that for "HI".

The title text deciphers to "AAAAAA A SCARY MONSTER AAAAAA!"

You can translate text to and from Scream Cipher using [https://github.com/matthewpwatkins/scream-cipher/ the Scream Cipher Translator].

Another recent comic featuring all "A"s was [[2957: A Crossword Puzzle]].

==Worked example==

<!-- If someone knows how to put this in one of those show/hide boxes, please do it -->

Say we want to encode "Scream" in the Scream Cipher. First we would need to split out word into the letters, so S, C, R, E, A, M. 

The first letter is S, so if we go to S in the table S is shown to become to Ǎ, C similarly becomes A̧, R becomes Ȃ, E corresponds to Ȃ, A is the main letter so A is unchanged to A, and M becomes Ǎ. If we then write them again in order, we find SCREAM becomes ǍA̧ȂȂAǍ.

To turn cipher text back into normal text, the process is repeated in reverse. To translate A̧ẢA̯A̰ȂȂ, we go to A̧ in the table and find A̧ becomes C. Ả similarly becomes I, A̯ becomes P, A̰ becomes H, Ȃ becomes E, and Ȃ becomes R. If we write the letters in order, we see that A̧ẢA̯A̰ȂȂ becomes CIPHER.

The symmetry of subtitution ciphers is apparent in the example, as in the SCREAM example R becomes Ȃ and E becomes Ȃ, and in the CIPHER example in the opposite direction Ȃ goes back to being R, and Ȃ goes back to being E, though in a different order.

==Table==

The {{w|Unicode}} names of the characters in the cipher are as follows:

{|class="wikitable"
! Input !! colspan=2 | Substitution
|-
| U+0041 LATIN CAPITAL LETTER A || A || '''U+0041 LATIN CAPITAL LETTER A
|-
| U+0042 LATIN CAPITAL LETTER B || Ȧ || '''U+0226 LATIN CAPITAL LETTER A WITH DOT ABOVE
|-
| U+0043 LATIN CAPITAL LETTER C || A̧ || U+0041 LATIN CAPITAL LETTER A, U+0327 COMBINING CEDILLA
|-
| U+0044 LATIN CAPITAL LETTER D || A̱ || U+0041 LATIN CAPITAL LETTER A, U+0331 COMBINING MACRON BELOW
|-
| U+0045 LATIN CAPITAL LETTER E || Ȃ || '''U+00C1 LATIN CAPITAL LETTER A WITH ACUTE
|-
| U+0046 LATIN CAPITAL LETTER F || A̮ || U+0041 LATIN CAPITAL LETTER A, U+032E COMBINING BREVE BELOW
|-
| U+0047 LATIN CAPITAL LETTER G || A̋ || U+0041 LATIN CAPITAL LETTER A, U+030B COMBINING DOUBLE ACUTE ACCENT
|-
| U+0048 LATIN CAPITAL LETTER H || A̰ || U+0041 LATIN CAPITAL LETTER A, U+0330 COMBINING TILDE BELOW
|-
| U+0049 LATIN CAPITAL LETTER I || Ả || '''U+1EA2 LATIN CAPITAL LETTER A WITH HOOK ABOVE
|-
| U+004A LATIN CAPITAL LETTER J || A̓ || U+0041 LATIN CAPITAL LETTER A, U+0313 COMBINING COMMA ABOVE
|-
| U+004B LATIN CAPITAL LETTER K || Ạ || '''U+1EA0 LATIN CAPITAL LETTER A WITH DOT BELOW
|-
| U+004C LATIN CAPITAL LETTER L || Ă || '''U+0102 LATIN CAPITAL LETTER A WITH BREVE
|-
| U+004D LATIN CAPITAL LETTER M || Ǎ || '''U+01CD LATIN CAPITAL LETTER A WITH CARON
|-
| U+004E LATIN CAPITAL LETTER N || Â || '''U+00C2 LATIN CAPITAL LETTER A WITH CIRCUMFLEX
|-
| U+004F LATIN CAPITAL LETTER O || Å || '''U+00C5 LATIN CAPITAL LETTER A WITH RING ABOVE
|-
| U+0050 LATIN CAPITAL LETTER P || A̯ || U+0041 LATIN CAPITAL LETTER A, U+032F COMBINING INVERTED BREVE BELOW
|-
| U+0051 LATIN CAPITAL LETTER Q || A̤ || U+0041 LATIN CAPITAL LETTER A, U+0324 COMBINING DIAERESIS BELOW
|-
| U+0052 LATIN CAPITAL LETTER R || Ȃ || '''U+0202 LATIN CAPITAL LETTER A WITH INVERTED BREVE
|-
| U+0053 LATIN CAPITAL LETTER S || Ã || '''U+00C3 LATIN CAPITAL LETTER A WITH TILDE
|-
| U+0054 LATIN CAPITAL LETTER T || Ā || '''U+0100 LATIN CAPITAL LETTER A WITH MACRON
|-
| U+0055 LATIN CAPITAL LETTER U || Ä || '''U+00C4 LATIN CAPITAL LETTER A WITH DIAERESIS
|-
| U+0056 LATIN CAPITAL LETTER V || À || '''U+00C0 LATIN CAPITAL LETTER A WITH GRAVE
|-
| U+0057 LATIN CAPITAL LETTER W || Ȁ || '''U+0200 LATIN CAPITAL LETTER A WITH DOUBLE GRAVE
|-
| U+0058 LATIN CAPITAL LETTER X || A̽ || U+0041 LATIN CAPITAL LETTER A, U+033D COMBINING X ABOVE
|-
| U+0059 LATIN CAPITAL LETTER Y || A̦ || U+0041 LATIN CAPITAL LETTER A, U+0326 COMBINING COMMA BELOW
|-
| U+005A LATIN CAPITAL LETTER Z || Ⱥ || '''U+023A LATIN CAPITAL LETTER A WITH STROKE
|}

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}

:[Top of the panel has 26 letters of the alphabet, each followed by a hyphen and the letter "A" with a unique diacritical mark for each. "A - A" at the top is an exception, where the latter doesn't have a diacritic.]
:{|
|A - A
|-
|B - Ȧ
|G - A̋
|L - Ă
|Q - A̤
|V - À
|-
|C - A̧
|H - A̰
|M - Ǎ
|R - Ȃ
|W - Ȁ
|-
|D - A̱
|I - Ả
|N - Â
|S - Ã
|X - A̽
|-
|E - Á
|J - A̓
|O - Å
|T - Ā
|Y - A̦
|-
|F - A̮
|K - Ạ
|P - A̯
|U - Ä
|Z - Ⱥ
|}
:[Cueball and Megan typing on their phones, Cueball with two hands and Megan with one hand.]
:Cueball's phone: A̰ÁĂĂÅ
:Megan's phone: A̰Ả

:[Caption below the panel:]
:In the ''Scream Cipher'', messages consist of all As, with different letters distinguished using diacritics.

{{comic discussion}}

[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Megan]]
[[Category:Language]]
[[Category:Cryptography]]