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The PRNG implementing the random() function only has 2^31 states and
therefore is unsafe to use for cryptography. Use arc4random() instead.
Fixes: cc34f04efd ("tools: image-host.c: use random instead of rand")
Addresses-Coverity-ID: 312953 Calling risky function
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>