XPRXWUIWUOLZYXBFTTJMDVOCTTXPPPKLEVROQPRFPLTHWSMOGVCYPG QSIJHIEGYPWFGRAMHXYUMOAAOMGBUYMRJNVXOAVZHIOWFXPTBTZNHL LHKHKLSJSLGKZYFYBUTFTOSFHHMZGRQFELYEKFHWILBDBDROHIZLIM MILZIHORDBDBLIWHFKEYLEFQRGZMHHFSOTFTUBYFYZKGLSJSLKHKHL LHNZTBTPXFWOIHZVAOXVNJRMYUBGMOAAOMUYXHMARGFWPYGEIHJISQ GPYCVGOMSWHTLPFRPQORVELKPPPXTTCOVDMJTTFBXYZLOUWIUWXRPXwhich was encrypted in the following simple way:
1. The quotation has been converted to numbers using A=0, B=1, C=2, ..., Z=25.
2. A second stream of numbers is made by reversing the sequence of numbers made in 1 above.
3. These two streams are added modulo 26.
4. The stream produced in 3 above is then converted using 0=A, 1=B, 2=C, ..., 25=Z.
The result of all this is the 324-long stream above.
Here is an example of encrypting a different quotation:
ITHASYETTOBEPROVENTHATINTELLIGENCEHASANYSURVIVALVALUE
I T H A S Y E T T O B E P R O V E N T H A T I N T E L L I G E N C E H A S A N Y S U R V I V A L V A L U E 8 19 7 0 18 24 4 19 19 14 1 4 15 17 14 21 4 13 19 7 0 19 8 13 19 4 11 11 8 6 4 13 2 4 7 0 18 0 13 24 18 20 17 21 8 21 0 11 21 0 11 20 4 4 20 11 0 21 11 0 21 8 21 17 20 18 24 13 0 18 0 7 4 2 13 4 6 8 11 11 4 19 13 8 19 0 7 19 13 4 21 14 17 15 4 1 14 19 19 4 24 18 0 7 19 8 12 13 18 0 13 9 4 14 1 9 18 24 7 15 1 21 22 13 0 11 2 6 12 19 1 15 22 15 1 19 12 6 2 11 0 13 22 21 1 15 7 24 18 9 1 14 4 9 13 0 18 13 12 M N S A N J E O B J S Y H P B V W N A L C G M T B P W P B T M G C L A N W V B P H Y S J B O E J N A S N MThe result of this is the 53-long stream:
MNSANJEOBJSYHPBVWNALCGMTBPWPBTMGCLANWVBPHYSJBOEJNASNM
What is the quotation which has been encrypted to the stream above starting XPRXWUIWUOLZYXBFTTJMDVOCTTX... ?
