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You have to verify downloaded archives integrity and check their signature to be sure that you have got trusted, untampered software. For integrity and authentication of downloaded binaries The GNU Privacy Guard is used. You must download signature (.sig) provided with the tarball.
For the very first time you need to import signing public keys. They are provided below, but be sure that you are reading them from the trusted source. Alternatively check this page from other sources and look for the mailing list announcements.
pub rsa2048/0xF2F59045FFE2F4A1 2015-03-10 uid Sergey Matveev (GoVPN release signing key) <stargrave@stargrave.org> sub rsa2048/0x3128EE3F8A6C750A 2015-03-10 -----BEGIN PGP PUBLIC KEY BLOCK----- mQENBFT/H6cBCADTf/oqoTTBAA/CCQuYtzg8vrXxyjXj9yy4lTWqMSwgLXMm8br/ kG0Jnk63oP3hggI3hm2mpuiNwpwrJiORLBZCe8JgZW71zG4LfhVpQeWd7fu8WxDx 0uUZWByz5KcK8c/kNWNDpSkMmmqdE/8v0YDFbsz5U+ytp/Kki/gj3BCeIX3jYOL1 fxczkv2okoU+aGYXt9z50VzheLUSRLzkkX8yNSpszqfB0LEEmUk8HO2fSS/bXwaY ZXX5//suH8V5hwq8vB8dHHCquZW6blyzcTa2KGIh6g2CmpypIQp/i5QAbzOCHKTM A1F7A1r0kYF2WfZOrycCfjUx3GA5B7sytuA3ABEBAAG0RFNlcmdleSBNYXR2ZWV2 IChHb1ZQTiByZWxlYXNlIHNpZ25pbmcga2V5KSA8c3RhcmdyYXZlQHN0YXJncmF2 ZS5vcmc+iQE8BBMBCAAmBQJU/x+nAhsDCAsKCQgHBAMCBxUKCQgLAwIFFgIBAwAC HgECF4AACgkQ8vWQRf/i9KEZ/AgAqYF/RRNwwhgLgFqTLfw3ha0FeiSso7H9ITDo cdJ/domLHaFvmwFIDQQKV8Zd1Rnj6xTCs2bq2O5hYMLrFZg85A9i5tLwkgFc9J5G +8K3K/dh9Y4pArbM+craO+xydrwLyg1zlXCezthWbL0iXO/CuGiuBBCZJqRJ9HV4 cZr4TRA3Znm5nt96rRsR86XqOgr0iOEDtYKfKW/IzDqOEgXUN5o2bUwuQawe9Y8d CngXzJcfb2eJ/TqSP9CxVWscjz4sAmD3/ECrHSjX7xsusIs46F2+VMlEXFuST52r zamfiGKlol8XvimUjKhlMWjqfdcJ0+jvFftsa7HXQUwRoQ1vJYheBBARCAAGBQJU /x/VAAoJEK4agQnkmFfvqn8A/ReK2ZZrnI9s0rzTsF1jrTZ1o5YowuINOzVMmLbE aYuGAP4iGwPgwVbANu4dWaP2N03oL4xFtmdaeNn3sB9ZqJOOyrkBDQRU/x+nAQgA uYBRyJVwhlE2SRIEmMggwr4gq1JBM2Ge5O46usf+YPUjCJKWoAj+MpQoq7r+oA/s E/6kGvWgngwV9prCdNkvcdwEWbb+n9PcMc2ZuIGRV3iOKYlYEBFV0bfM9zEV2jar 1YQ+J/48UX7R00cYJuXel7Dy77V9eNd+Ukyowm93fggFlBDBGBjVbNtfIorHNYjB 01CCu3i/8yxrMyFRvMKyAVEGp3obgmlam4DNkNIhFMv3du0tFnDFBsZf7N0kbLWI xEEJoc/jxaezDytQpUr3RhlMsLV6N/jjIZuy36QO1sbFeOe2to0E7ixaFzNCWsqY cxUfnJ3wi7hOiOwE2PF3tQARAQABiQEfBBgBCAAJBQJU/x+nAhsMAAoJEPL1kEX/ 4vShrVcIAKLUwMn7WgK6thmwPjdwP5V/jTlsWLWk2O/LEN4W/R0mw2hRsgRG/8Sz qlAP6vfl7ERaWuyL+fp72rKnGTGU9CEvn6PKmaG7bi4tGEvWXscNc10r0leIAP63 pkQOa6Nyx2axJlJdSuTsYetd1ZgNpHNng+lxSUBlkPMOhPd/P/Ok7DShZjd2jhQ1 jUbjWn+P7ARGEvgdd5utNjy/RaSwrLG8NXj3I+XuksG0/TPeG0zu9NOPzWZq9sCc 5VbDNJTYtsMFs1etHE95Efmx6yUquQyB+g/HgvkH/LzthBawVVHxZNzzHgc6KN5w E0itJPXMaQL+juUfiNM0i2R1O8nJo14= =LJzj -----END PGP PUBLIC KEY BLOCK-----