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sigsh is a non-interactive, signature requiring and verifying command
interpreter. More accurately, it is a signature verification wrapper
around a given shell. It reads input in PKCS#7 format from standard in,
verifies the signature and, if the signature matches, pipes the decoded
input into the command interpreter.
Related:
NetBSD's Veriexec
MS Powershell ExecutionPolicy
OpenBSD's "Stephanie" / TPE
http://packetfactory.openwall.net/projects/stephanie/index.html
Linux Trusted Path Execution
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