JavaScrypt

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JavaScrypt, a high-security data encryption solution which runs entirely in your Web browser. To use the page, your browser must support JavaScript.

JavaScrypt runs entirely in your browser--nothing is sent to any Web site when you use it. You can, if you wish, download JavaScrypt to your own computer and use it when not connected to the Internet.

JavaScrypt's encryption facilities use the Advanced Encryption Standard (AES) adopted by the United States as Federal Information Processing Standard 197. AES supports key lengths of 128, 192, and 256 bits; JavaScrypt uses 256 bit keys exclusively.

Encrypted message sample

#####  Encrypted: decrypt with http://www.fourmilab.ch/javascrypt/
ZZZZZ GLGXE NPCED CUGUT PFDLU WGJRU TABPW OJJRG ICUQE KSCRC ECTEM
GRVVJ ENJTA MFUDU BLGMK IXKKG VAOQL MTIUR ORNXP WPFAB WMIKV VPDWB
ITKTX QCBCM RMBAE UDVEB OSRZZ YYYYY
#####  End encrypted message

Encrypted message additionally hidden in text

Dyspneic cushats lawines.  Carnify resalute fluidics dimmest dioceses
ologist shop.  Aucubas popedoms gardenia bustling, maremme.  Bowleg
imparks restored praus breaths, fabling.  Fidges hosen, sparker disunity
chics.  Redbait met gestapo ixtle busses.  Icily.

The key is Fnord.