ecco una semplice funzione che implementa il rot13 in c++.

Rot13 è uno dei più semplici algoritmi di crittografia, esso ruota ogni lettera di 13 posizioni rendendo il testo non direttamente leggibile, ovvimanete come tutti gli algoritmi che lavorano carattere per carattere è vulnerabile in caso si analizzino le frequenze.

Come si può vedere in caso di necessità definendo ROTATE_NUM verranno modificati pure i numeri.

char ch_to_rot13(char ch)
{
     char rot13;
    #ifdef ROTATE_NUM
     //
     //  [0:4] -> [5:9]
     //
     if ( ‘0′ <= ch && ch <= '4' )
     {
         rot13 = ch + 5;
     }
     //
     //  [5:9] -> [0:4]
     //
     else if ( ‘5′ <= ch && ch <= '9' )
     {
         rot13 = ch – 5;
     }
     //
     //  [A:M] -> [N:Z]
     //
    #endif
     if ( ‘A’ <= ch && ch <= 'M' )
     {
         rot13 = ch + 13;
     }
    //
    //  [N:Z] -> [A:M]
    //
    else if ( ‘N’ <= ch && ch <= 'Z' )
    {
         rot13 = ch – 13;
     }
     //
     //  [a:m] -> [n:z]
     //
     else if ( ‘a’ <= ch && ch <= 'm' )
     {
         rot13 = ch + 13;
     }
     //
     //  [n:z] -> [a:m]
     //
     else if ( ‘n’ <= ch && ch <= 'z' )
     {
         rot13 = ch – 13;
     }
     else
     {
         rot13 = ch;
     }

     return rot13;
}

void rot13(char *data,char *out,int len=-1)
{
     if(len==-1)
     len=strlen(data);

     for(int c=0;c          out[c]=ch_to_rot13(data[c]);

     out[len]=0;
     return;
}

Here’s a simple C routine written as a preprocessor macro that will perform ROT13 encoding on a single character.

#define rot13(x) isalpha(x) ? tolower(x)>'m' ? x-13 : x+13 : x

If your C compiler’s version of tolower expands to a nested ternary expression, then the above macro may generate some tricky-to-read code out of the preprocessor phase.

Here’s a simple program to read a string from stdin and ROT13 encode it using the above macro.

//
// A simple ROT13 encoder macro
//
// License: MIT / X11
// Copyright (c) 2009 by James K. Lawless
// jimbo@radiks.net http://www.radiks.net/~jimbo
// http://www.mailsend-online.com
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.

// sorry about the includes below.  Something in the WordPress
// source code widget is garbling up the
// source.  Please be sure to put angle brackets around the
// header file names
#include stdio.h
#include ctype.h

#define rot13(x) isalpha(x) ? tolower(x)>'m' ? x-13 : x+13 : x

int main() {
   int c;
   while((c=fgetc(stdin))!=-1)
      fputc(rot13(c),stdout);
   return 0;
}

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Unless otherwise noted, all code and text entries are Copyright © 2009 by James K. Lawless

Habis membaca Digital Fortress karya Dan Brown dan Pengantar Ilmu Kriptografi karya Dony Ariyus, saya jadi terinspirasi untuk posting tentang kode kaisar, lebih spesifiknya, tentang ROT13.

ROT13, atau ROTate-by-13 adalah penerapan kode kaisar dengan k=13.

Algoritma kriptografi yang satu ini mengubah teks asli menjadi chiper text dengan cara mengubah semua alfabet, A menjadi N, B menjadi O, C menjadi P, dan seterusnya.

Proses enkripsi dari chiper text menjadi teks jelas / plain text juga menggunakan metode yang sama, sehingga algoritma ini memiliki kunci dekripsi dan kunci enkripsi yang sama.

Contoh penggunaan:
SUMBERINFORMASI –> FHZOREVASBEZNFV

I’m going to shut up about politics for a bit and allow myself a bit of introspection.  Here’s a note to self: Self, when you get your act more together than it already is, you want to head out to the Left Coast.  I am thinking the Coast Starlight would make for a wonderful trip, possibly even starting in San Diego instead of Los Angeles and just heading all the way up to Seattle, and then through VIA Rail to Vancouver.  (Heck, I could visit after a preliminary trip to Ocean City, and complete an unusual goal, should I choose to.)  Every time I get on the Series of Tubes, I find more amazing people all living on the other side of the continent, right next to that other beautiful ocean.

Vg vf, bs pbhefr, nyfb jbegu vg gb zragvba gung znal bs gubfr nznmvat crbcyr bhg gurer ner irel ornhgvshy, va obgu zvaq naq obql, naq juvyr V jbhyq qrfpevor gurz nf zbeny crbcyr, gung zbenyvgl qbrfa’g arprffnevyl vzcyl n terng qrny bs unathcf ertneqvat frk.  Ol gung V zrna nf n pbaprcg; V’z abg fnlvat guvf jbhyq or n gjragl-guerr uhaqerq zvyr abbxvr eha…V’z nyfb abg fnlvat, ubjrire, gung gurfr ybiryl crbcyr jbhyq or bccbfrq gb qbvat fbzrguvat jvgu zr be zl ybiryl cnegare ba guvf oybt.  Naq V jvyy fnl bhgevtug gung gurer fher nf uryy frrz gb or n ybg zber sbyxf yvxr gung bhg gurer guna gurer ner urer.  Qnzzvg.

If I’m going to watch auto racing at all, I watch Formula 1 in preference to NASCAR. The former is actual racing, which involves turning in both directions and manuevering in and out of traffic on roads meant for real cars; the latter is lining up in a row and turning left for an hour or so, punctuated by someone crashing into a wall, probably from sheer monotony. The real reason that Americans do not watch F1 is of course it’s “European” – a word meaning “not American” to most American slobs.  Sure, some of the best drivers are from Brazil or Canada or, in the case of the fantastically named Scott Speed, the U.S., but I don’t care, it’s jest not raht, Bubba.

More Americans, however, may pay attention to F1 now given the Führer – er, sorry, furor - over the recent doings of Max Mosley, the chief muckety-muck of Grand Prix auto racing. Seems that last week, Mosley was videoed in the company of what News of the World described as prostitutes, getting (or giving – the article’s unclear) a BDSM session; the reported price was the equivalent of US$5000. (Client #9, call your office.)

The particularly fun part, for the tabloids and everyone else, was the possible Nazi overtones of the whole session: counting the strokes of the lash in German, shouting orders in German-accented English à la Colonel Klink (“She needs more of ze punishment!“), some prisoner-and-captor role play, including a “check for lice” and a reading of a list of personal effects. It gets better: Mosley’s father was Sir Oswald Mosley – yes, as in the guy behind the British Union of Fascists during WWII. The N.Y. Times has the story here, and here’s some video (appropriate warnings here).

Svefg guvatf svefg – vf vg ernyyl jbegu vg?  V zrna, va gur fgevpgyl cuvybfbcuvpny frafr, vs lbh unir gur zbarl naq lbh yvxr gb trg “dhnyvgl”, gura sne or vg sebz zr…ohg ol qnza, sbhe be svir gubhfnaq ohpxf?  Rvgure lbh unir sne zber zbarl guna frafr, be lbh ernyyl whfg pnaabg trg orngra be shpxrq va nal bgure jnl.  Orfvqrf, V guvax vg’f va gur thl pbqr – naq vs vg vfa’g, vg fubhyq or – gung vs lbh unir gung xvaq bs zbarl sbe frk, gura lbh fubhyq funer gur jrnygu naq trg fbzr sbe lbhe ohqqvrf.  Abg gung V jbhyq unir orra yvxryl gb unat bhg jvgu rvgure bs gurfr thlf ng nal cbvag, ohg vg’f gur cevapvcyr bs gur guvat.

Nf jryy: gurer ner cebonoyl jbzra (be zra, be jngrezrybaf, be jungrire trgf lbh bss) jub jbhyq qb guvf nf jryy sbe zhpu, zhpu purncre.

Sbe uvf cneg, Zbfyrl fnlf gung ur qvqa’g qb nalguvat vyyrtny (juvpu V jbhyq thrff zrnaf gurl qvqa’g pngpu uvz shpxvat ba pnzren), qravrf gung gurer jnf nal Anmv ebyr-cynlvat tbvat ba (yrff qrsrafvoyr), naq qrpevrf gung uvf cevinpl jnf vainqrq (haqravnoyl gehr naq haqrefgnaqnoyr).

There is another aspect to this besides the coded bit above, and by saying this, I don’t mean to sound like Jonah Goldberg.*  (To do so would probably require a lobotomy.)  It is very likely, given the reactions of those in the racing world, that he will lose his job over this, which is problematic.  How Mosley gets his jollies off-hours shouldn’t and really doesn’t have anything to do with his management of a racing organization.  Of course, people are then saying it isn’t that…it’s literally whether or not he play-acted like a Nazi.  Especially in light of his heritage, the implications are of course that he might really be a Nazi, but that’s an open question, and even if true, the situation might remain problematic.**

I think it’s right to say that no one in their right mind would seriously adhere to Nazism, but I also think that about many, many other philosophies held by very prominent people who have important private or even public positions…and I don’t know if I would call upon them to be ousted from those positions due to their beliefs.

There are some wider implications to this.  Do we as a society or a world have a right to outlaw certain types of thinking?  Are some philosophies – not actions, just literal ways of thinking – too dangerous to be allowed?  What if Mosley just said, “Yes, I’m a Nazi and I’m proud of that, and I don’t plan to apologize or change anything about myself.”  Should he then be barred being the head of F1?  from any employment at all?

As I was with Don Imus when he was fired due to insensitive comments, I’m extremely leery of going this route.  It smacks too much of the re-education camps of Mao and other totalitarians, and it doesn’t fit my personal belief that you challenge bad ideas with good ideas, and let them naturally die as a result; the idea of banning speech and ideas seems to assume that society is composed of people who cannot think for themselves and wouldn’t know the difference – a possibility, if one is really cynical.  It also gives the idiots who spout these sick ideas an unwarranted sense of righteousness through persecution.

Finally, there’s also the aspect of placing one’s self in such a situation.  I have no doubt there are plenty of people out there who would love to prevent me from expressing my political, social, religious, or sexual views, and some of them have the potential of gaining power in government or corporations.  A few, frighteningly, already have.  It’s essential to avoid censorship of others’ views no matter what they are, so that ours can’t be silenced reciprocally…and even if they do (which they do), we should remain above such behavior.  It’s morally wrong to go there.

* I’m mentioning Goldberg a lot lately, which is worrisome.  The real reason why is because he’s so transparently wrong and such a nasty, preening little schmuck that it’s very easy to set one’s self up as superior.  The worrisome part is that it’s easy to beat up a third-grader, too, but hardly proof of one’s might.  If the best I can do is say I’m better than Goldberg, I really need to take stock of my intellect.

** And please…let’s not go down the knee-jerk path of “zOMG scooterbird’s defending Nazis” or what I am or am not comparing Hitler to.  My point is, having the right to say something and whether or not something is right to say are two different things.  You conflate them, you end up in the province of groupthink, and that’s not a good place to be.

V’ir cebterffrq gb gur cbvag abj jvgu guvf pbyq, be syh, be jungrire gur uryy vg vf, gung V ab ybatre frrz gb or fcvxvat n srire…ohg gung’f n jnlf njnl sebz orvat “jryy”, naq vg’f rkgerzryl sehfgengvat jura lbhe zvaq vf ernql sbe lbh gb or orggre orsber lbhe npghny obql vf (juvpu V fhfcrpg unf fbzrguvat gb qb jvgu zl ntr nf jryy). N srj zbeavatf ntb, va gur zvqfg bs nabgure avtug bs bss-naq-ba srire, fbzr ybhfl, oebapuvny pbhtuvat svgf, naq bgure guvatf gung pbzr jvgu orvat fvpx, V ernyvmrq jung gur jbefg cneg bs guvf jubyr guvat vf…naq vg pnzr gb zr, cebonoyl nf n erfhyg bs gur srire zber guna nalguvat ryfr, guebhtu n erpbyyrpgvba bs bar bs zl snibevgr, yrg’f fnl, abgbevbhf zbivrf.

Gurer’f n fprar va N Pybpxjbex Benatr jurer bhe “ureb” Nyrk, cynlrq ol Znypbyz ZpQbjryy, unf haqretbar n avtugznevfu, Fxvaare-glcr nibvqnapr grpuavdhr va juvpu ur’f orra frafvgvmrq gb frk, ivbyrapr, naq gurve pbzovangvba. (ZpQbjryy nyfb cynlrq Pnyvthyn va gur svyz bs gur fnzr anzr, juvpu erdhverq guvatf yvxr ba-pnzren encrf bs obgu frkrf naq fvzvyneyl shpxrq-hc orunivbe, fb…jryy, ln tbggn jbaqre nobhg gung thl.) Naljnl, gur grpuavdhr vf grfgrq ol univat n jbzna fgrc hc gb Nyrk naq gnxr bss ure fuveg, erirnyvat n ybiryl cnve bs oernfgvfrf. (Gur phgnjnl ybbx gb gur fxrcgvpny cevfba bssvpvny ng gung cbvag vf nzhfvat.) Nyrk, yvxr nal obl jvgu n jbexvat zrgnobyvfz, tbrf sbe n avpr teno, jura, jvgu uvf unaqf sebmra na vapu be fb njnl, ur rzvgf n tnjqnjshy jergpurq fpernz bs cnva, anhfrn…fbzr unhagvat, vaqrfpevonoyr, tvoorevat srne be gbegher gung pnhfrf uvz gb qbhoyr-hc naq erqhprf uvz gb n dhvirevat, hanoyr gb shapgvba zrff.

Zl zvaq ng gur gvzr jnf guvaxvat bs qbvat fhpu gb zl ybiryl jvsr, naq npghnyyl zbivat nebhaq va orq, orvat njnxr naq njner rabhtu gb qb fb, pnhfrq n ernpgvba va zl obql juvpu, juvyr vg jnfa’g dhvgr nf frirer, znqr zr erpnyy gung fprar naq flzcnguvmr qrrcyl sbe zl irel orfg qebbtvr, bu zl oehiiref…

Poco tempo fa sono venuto a conoscenza di questa interessante estensione per Firefox chiamata LeetKey. Per molti la sua utilità sarà alquanto dubbia ma per gente che gira molto su forum di hacking o a cui piace la cifratura le stringhe in base64, rot13, binario sono all’ordine del giorno.

Cosa possiamo fare con questa estensione?

LeetKey ha principalmente 4 funzioni:

• Toggle Editors (permette di scrivere con la cifratura desiderata)
• Text Transformers (cifra/decifra il testo selezionato)
• Text Encryptors (cifra/decifra il testo in DES o AES)
• LeetKey editor (editor integrato)

Le cifrature disoponibili sono molteplici, le principali sono ROT13, Base64, URL encoding, HEX, BIN, AES, DES.

Funzioni divertenti (e inutili)

• scrivere direttamente in 1337 (Leet) Es: (140! (0m3 v4?
• srcivere in morse utilizzando normalmente la tastiera oppure con la barra spaziatrice per fare tratto o punto. Es.: .-.. .. -. ..- – …. . -… . … -
• Text Loop fa si che qualsiasi tasto premiamo appaia sempre la scritta “I am now controlling your motor skills. Obey my will. Do not try to fight it, embrace the change.”
• Dvorak Keyboard cambia il layout della nostra tastiera con quello di Dvorak
• Reverse ci fa scrivere al contrario

Altro

• funzioni per convertire il testo in lettere maiuscole o minuscole (utilissimo se si è moderatori di forum)
• editor dove possiamo provare tutte le funzioni

These questions are deliberately “trick” questions in that they require one to pay attention to exact wording and use some logic.

NOTE: Bonus question added 1/13/2008.

I have obscured the answers using ROT13, an “encryption” mechanism that is completely insecure and is best for obscuring punch lines of jokes and answers to questions. It’s a simple cypher where the letters of the alphabet are assigned values from 0 – 25. Since there are 26 letters, adding 13 to the value for each letter and using modulus 26 will provide both “encryption” and “decryption”. If you need the answer to any of these questions, just paste the funny looking text under the question onto the ROT13 page below, click Cypher, and appreciate that someone has a URL even shorter than would be generated by tinyurl. All answers will be spelled out, even when numeric due to the cypher algorithm used.

http://rot13.com/

Note: If you look up the answer, expect a snarky one.

1. A ship standing in one of the locks of the Panama Canal extends 42 feet above the water line. The water rises in th elocks at a rate of 6 feet per minute. After 3 minutes, how far above the water line does the ship extend?

A) Sbegl-gjb srrg, nffhzvat vg vf abg fvaxvat.

2. How many three cent stamps are there in a dozen?

A) Gjryir.

3. Do they have a fourth of July in England.

A) Bs pbhefr gurl qb, gubhtu gurl yvxryl qb abg pryroengr vg.

4. Why can’t a man living in Mobile, Alabama be buried west of the Mississippi River?

A) Orpnhfr ur’f nyvir. Grpuavpnyyl, bs pbhefr, ur pna or, ohg znl abg or. Vg’f ernyyl n crezvffvbaf dhrfgvba.

5. How many birthdays does the average man have?

A) Whfg gur bar, bs pbhefr.

6. If you had only one match, entered a room with a kerosene lamp, an oil burner, and a wood stove, what would you light first?

A) V gbbx zl gvzr ba guvf grfg. Guvf jnf gur bayl bar V tbg jebat. Gur nafjre, qhu, vf gur zngpu.

7. If a doctor gives you three pills and tells you to take one every half hour, how long would they last?

A) Na ubhe, bar abj, bar va unys na ubhe, bar va bar ubhe. Qbar. Bs pbhefr, ubj ybat orsber gurl qvtrfg vf bhg bs fpbcr bs guvf dhrfgvba.

8. Some months have 31 days, some 30. How many have 28?

A) Nyy bs gurz.

9. You’re driving a bus. At the first stop, three people get on. At the second stop, nine people get on and two get off. At the third stop, four people get on and six get off. How old is the bus driver?

A) V pna’g nafjre gung. Creuncf lbh pna. Ubj byq ner lbh? (Lbh’er qevivat n ohf…)

10. I have two United States coins totaling thirty cents. One is not a nickel. What two coins do I have?

A) N dhnegre naq n avpxry. Gur dhnegre vf vaqrrq abg n avpxry. Bar vf abg. Gur bgure vf. Trg vg abj? (Gbyq lbh gurer’q or fanex urer.)

11. A farmer had nineteen sheep. All but nine died. How many does he have left?

A) BX, ba guvf bar, V’yy gnxr rvgure avar be avargrra. Ur znl fgvyy unir gur gra qrnq barf unatvat va n zrng ybpxre fbzrjurer.

12. Divide thirty by one half. Add ten. What is the total?

A) Friragl. Vs lbh tbg gjragl svir, lbh qvivqrq guvegl ol gjb, abg ol bar unys.

13. An airplane flying from Canada to the U.S. crashes on the border. Where do they bury the survivors?

A) Gurl qba’g ohel gur fheivibef.

14. Two people playing checkers played five games. Each won the same number of games with no ties. Explain.

A) Gurl jrer abg cynlvat rnpu bgure.

15. Take two apples from six apples. How many apples do you have?

A) Lbh gbbx gjb. V qba’g pner ubj znal gurer jrer. Lbh unir gjb.

16. An archaeologist claims to have found a gold coin dated forty-six BC. What is the coin worth?

A) Vg’f jrvtug va tbyq, vs naq bayl vs vg’f erny tbyq. Ab bar jbhyq unir qngrq gur pbva sbegl-fvk OP. Ubj jbhyq gurl unir xabja?

17. A woman gives a begger fifty cents. The woman is the beggar’s sister. The begger is not the woman’s brother. How come?

A) Gur orttne vf n jbzna.

18. How many animals of each species did Moses allegedly bring aboard the ark?

A) Gung yrtraq vf nobhg Abnu, abg Zbfrf. Unq gur dhrfgvba orra nobhg Abnu, gur yrtraq fcrpvsvrf n cnve bs rnpu aba-xbfure navzny naq frira cnvef bs rnpu bs gur xbfure navznyf.

19. Is it legal for a man to marry his widow’s sister in North Carolina?

A) Qrnq zra qba’g trg zneevrq. Jryy, bar qbrf, ohg bayl vs lbh oryvrir gur zna rire rira rkvfgrq, juvpu frrzf qbhogshy.

20. You’re in a round room with an all southern exposure. A bear walks by. What color is the bear?

A) Lbh’er va n ebhaq ebbz jvgu na nyy fbhgurea rkcbfher. Gurersber, lbh ner ng gur Abegu Cbyr. Gurersber, gur orne vf juvgr, be ernyyl fbeg bs n pernz pbybe.

Bonus: Why are man hole covers round? (Person hole covers?)

Snarky Answer: Orpnhfr gur ubyrf ner ebhaq.

Serious Answer: Orpnhfr ebhaq vf gur bayl funcr gung jvyy abg nyybj gur pbire gb snyy guebhtu gur ubyr naq xvyy n jbexre orybj.

How did you do? Have any similar questions to share?

¿Cuántas veces nos hemos encontrado con la situación de, por ejemplo, querer hablar de una película o serie actual y no hemos poder hacerlo con total libertad debido a los spoilers? Muchas, ¿verdad? Pues hoy, de casualidad, me he enterado de un sistema que al parecer no es nada nuevo pero que permite que puedas escribir spoilers o cualquier otra información delicada sin miedo a que los que no quieran acceder a ella puedan pasar la vista por encima del texto sin problemas.

Se trata de Rot13, un tipo de cifrado que sustituye las letras que escribes por las que ocupan la posición número trece hacia adelante en el abecedario. De esta manera, si pretendemos escribir una entrada o un comentario con ciertos datos relevantes, siempre podemos entrar en Rot13, picar allí el texto y publicar el código que nos devuelve, así el que esté interesado en saber qué es lo que hemos escrito solo tiene que volver al Rot13, pegar nuestro cifrado y leer el texto sin problemas. Me parece una solución genial. Para que probéis el sistema os dejo una muestra:

“Irb zhpub cbgrapvny, creb rfgá qrfcreqvpvnqb. Gbqn han trarenpvóa genonwnaqb ra tnfbyvarenf, fveivraqb zrfnf, b fvraqb rfpynibf bsvpvavfgnf.Yn choyvpvqnq abf unpr qrfrne pbpurf l ebcnf, grarzbf rzcyrbf dhr bqvnzbf cnen pbzcene zvreqn dhr ab arprfvgnzbf. Fbzbf ybf uvwbf znyqvgbf qr yn uvfgbevn, qrfneenvtnqbf l fva bowrgvibf, ab urzbf fhsevqb han tena threen, av han qrcerfvóa. Ahrfgen threen rf yn threen rfcvevghny, ahrfgen tena qrcerfvóa rf ahrfgen ivqn. Perpvzbf pba yn gryrivfvóa dhr abf uvmb perre dhr nytúa qín freínzbf zvyybanevbf, qvbfrf qry pvar, b rfgeryynf qry ebpx. Creb ab yb frerzbf, l cbpb n cbpb yb ragraqrzbf, yb dhr unpr dhr rfgrzbf zhl pnoernqbf”

Ry pyho qr yn yhpun

Enlace Rot13 | Más información

Live Hasher is a new recently made JavaScript app by me. It hashes your string of choice right in front of you, all through JavaScript.

It supports these algorithms:

• MD4 Message Digest 4
• MD5 Message Digest 5
• SHA-1 Secure Hash Algorithm
• ROT13 Rotate-13

It runs very quickly and efficiently, with an option to copy the hashed string to your clipboard.

To try it out, visit it at the lab portion of my website:

(link)

This mail has been ROT-13 encrypted twice for higher security.

If you don’t get it, look up ROT-13 in wikipedia