Table 5. Cisco Aironet 1140 Series Power Injector Product Numbers Product Number Product Description AIR-PWRINJ4= Cisco Aironet Power Injector for the 1140 Series (Spare) Power Supply A Cisco Aironet power supply is not included with the Cisco Aironet 1140 Series and may be purchased separately (Table 6). The AIR-PWR-B is the recommended power supply for the 1140 Series.
public-key encryption. Related Terms. A cryptographic system that uses two keys -- a public key known to everyone and a private or secret key known only to the recipient of the message. When John wants to send a secure message to Jane, he uses Jane's public key to encrypt the message. Jane then uses her private key to decryptit.
As for software to hide your IP, hackers have got the technologies to break through it too. It is only VPN which is entirely safe from threats emanating from hackers, spammers, etc. Encryption is one of the key tools which make VPN such a secure medium for accessing internet without any fear of data being exposed. All data going through the tunnel is encrypted at one end and decrypted at the other end.