Monero is a safe and encrypted electronic money can not be traced It comes from an open-source, decentralized And anyone can see the freedom of development projects In this film, we want to talk about a ring signature In a movie We discussed how Monero is concealed by address To avoid public address transaction output is connected to a payee This is the effect of one-time use public reached One-time public key can only be re-spent payee And only output transaction payee to view it on the block chain owned by Therefore, all output transactions are not being tracked Ensures privacy without fear payee This end of the transaction entry Privacy payer's signature is by an annular (ring signatures) to protect Ring signature is a form of digital signature method With the signature of a mixed group of signatories to create a signature can not distinguish between sources And to authorize a transaction This analogy can be sent by check from a joint bank account But who the real signer is not known The digital signature is signed by a non-signatory to a number of persons and composition of the "ring" Each participant is equal Which really used to sign the one-time cost of key From pre-sum payment transaction output of the payer The remaining non-signatory with several sources from the old trading on the output block chain As bait These outputs will be synthesized a new transaction input From the perspective of a third party Each transaction entered are the same and can not be distinguished from each other This process can help to hide the payment of its previous trading sources Because they can not distinguish between transaction output source At this point you may be wondering Which output if a third party can not verify the transaction has not been spent How was that to prevent repetition of the same transaction output to spend it? This situation can be key images (key image) to solve Key image from a set of cryptographic key output is generated when the transaction takes Will be included in the sum of each ring-signature transactions Each transaction output will correspond to a key image exists on the block chain Based on the principle of cryptography Key images can not be pushed back Yes generated by the output of which deal All key image list will be recorded in the block chain The miners to verify the transaction output is not repeated spending Let's use an example to see if this is how it works Alice wants to sign with a ring size (ringsize) as a way to pay 5 to Bob Monero At this point five transactions in which an input That would be derived from Alice's wallet Will be consumed in the transaction The remaining four input transaction is random selection from the block chain As bait This will form a cyclic five input signature A true signature input anything is possible For an external observer, including Bob himself Which are one-time cost of a key input is really no way of knowing from Alice However, with key image Miners on the Internet to verify Bob received this output is not being spent off In this way By using a ring signature techniques to confuse the source of the transaction entered Monero can protect the privacy payer Ensure that every Monero sources are not tracked In order to improve trade between the two sides privacy Ring signature for secure transactions Usually referred to as RingCT Monero was used to hide the amount of the transaction RingCT brought many benefits to signing agreements ring We will discuss in the next episode If you are interested in learning what makes Monero become the most important privacy encryption currency See our other videos or see getmoneroorg