Yes, but you should use v0.6.0 or higher. That is the first version that shares files using TLS, a widely adopted cryptographic protocol that provides data security over the networks.
However, to mitigate impersonation attacks, check if the fingerprint of the other on your screen actually matches that of the other device. We do not recommend and do not take responsibility using tiShare versions below v0.6.0 in public and untrusted networks, such as coffee shop Wi-Fi routers. For security, please update your tiShare apps.