: Bad session key

[xstation]

on linux 17.3 rosa

having problems decypting
encrypted with  gpg 1.4.11

how have installed from source 

amma at amma-Aspire-F5-571 ~ $ gpg2 --help
gpg (GnuPG) 2.0.22
libgcrypt 1.5.3
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law
.
aldo gunpg2 was installed from the apt-get install package

amma at amma-Aspire-F5-571 ~/Desktop $ gpg2 -d mtogo.zip.gpg
gpg: CAST5 encrypted data
gpg: encrypted with 1 passphrase
gpg: DBG: cleared passphrase cached with ID: S8E43B9269CCD3E30
gpg: decryption failed: Bad session key

if i use 
amma at amma-Aspire-F5-571 ~/Desktop $ gpg -d mtogo.zip.gpg
gpg: CAST5 encrypted data
gpg: encrypted with 1 passphrase
gpg: decryption failed: Bad session key
 same thing but I notice for about 2 minutes  my cpu goes up to 76% while
gpg is running then stops



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