Vg vf vaperqvoyr gb guvax gung fbzr sbezf bs rapelcgvba ner rnfvyl
oebxra.  Bar cbchyne sbez bs rapelcgvat grkg, pnyyrq EBG-13 (EBG 
zrnavat EBGngr) vf fb rnfvyl oernxnoyr gung crbcyr jub hfr vg serdhragyl 
pynvz gung vg fubhyq bayl or hfrq sbe ceriragvba bs nppvqragny ernqvat 
bs pregnva grkg.  Nabgure sbez bs rapelcgvba, xabja nf QRF, jnf ng bar 
gvzr zrnag gb or n frevbhf sbez bs frpher rapelcgvba ohg gurfr qnlf na 
betnavmngvba yvxr gur qvfgevohgrq pbzchgvat flfgrz urnqdhnegrerq ng 
qvfgevohgrq.arg pna oernx QRF rapelcgvba va yrff guna 24 ubhef 
jvgu n oehgr sbepr nggnpx.  Zrnajuvyr, zhpu zber 
qvssvphyg sbezf bs rapelcgvba yvxr EP5 pna 
gnxr nf ybat nf 10 lrnef sbe 
gur fnzrqvfgevohgrq 
argjbex gb penpx.

It is incredible 
to think that some forms of 
encryption are easily broken.  One 
popular form of encrypting text, called ROT-13
(ROT meaning ROTate) is so easily breakable that people who use it
frequently claim that it should only be used for prevention of 
accidental reading of certain text.  Another form of encryption, known
as DES, was at one time meant to be a serious form of secure encryption
but these days an organization like the distributed computing system
headquartered at distributed.net can break DES encryption in less than
24 hours with a brute force attack.  Meanwhile, much more difficult 
forms of encryption like RC5 can take as long as 10 years for the same
distributed network to crack.