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Questions  |  score: 5  |  Solved By 4 People  |  30260 views  |  since Jan 05, 2014 - 01:03:45

Three Times Sad (Crypto)

Three Times Sad
Below are three encrypted messages intercepted in a recent raid. Our latest information suggest the sender uses OTPs using 64-bit LFSR (key byte stream is generated msb first) and that he was setting up some kind of teleconferencing.

There is also talk of a master key. We would be very grateful if you can find it for us.
The intercepted messages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RY+8WeVxAagf5ad82yANC+qF5qhDRo5oDbhVoliDaoxDHPsWDAKnM/5Ke3REVx5iOF3RtbKDTb/E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ldALnCi50AfzeVdukN8E8z7U1B36S443RLITjoTsvMFBAktEfOqDewJjT7339DOBRWmwNx0qVoHG
UHYeuYERRhrCsF1s1jdX2ch3Bcd+QpQhKZnzD2Nq+NEL+BK99englp+KlihumP+8ytOyYFpso9v1
OVcdSo05KNmHOLRV/dY+Z+PYDHrtq7G2itFAlQu0VxEiUl06OxtMilmG5c61iKk5D4r8uqV79gn8
/JrBVumj5mTTG/ebVb4EZOV3B+0oWrZZ47u8l0wgZFCpl1Pf2mumS1T+4Qep6rcGphHYNvOt4Sel
421HZa2tOJQzLJmuTvT09mpP5z98fc3Cw2kSsrcjHgpSUEwQ8azNt/5hntGlsqleBMDPgGF4BKR0
s3mmloTCE39usUIkoI52m41rFrG0Cx/jNgywb4gU5JlEUH+JitVgAM6c+jGjWKdMmvuB8QuITjzm
1lDD2rDTpae4VDtfgOmxFYitoDlQDZn8wok=
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