Variables in Bamboo specs are encrypted with the same cipher

When exporting Bamboo specs, one will find that the variables are all encrypted with the same cipher, which can be considered insecure.

new Variable("PASSWORD",
"BAMSCRT@0@0@mE/<some string>=="))

Compare the encrypted value for PASSWORD with the same in the spec for a different build plan:

new Variable("PASSWORD",
"BAMSCRT@0@0@mE/<some string>=="))