Crypto currency by definition is not secure since it is a made up currency and as such no currency at all. Because for it to be a currency a central bank and a currancy a central bank needs to back it. Now then you will be asking why has Bitcoin reached $1000? It is called Uber Ponzi Scsm primarily driven by CNBC. Why?

hi, most popular criptocurrency my country is https://www.aisi.io/ :)

AISI coin is a cryptographic that represents a digital value -
Provided by blocking technology. Currently AISI uses decentralization
waves blocking. This decision, the best service and protection
Was made to secure
AISI coin offers customers quick and effective transfers, platforms
On any electronic wallet

Sorry my english

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I doubt that any are more secure than any of the others. All of them are only as secure as the WEAKEST link in the chain. Security is usually dependent upon human access and, like all other things human, security is only as good as the people who maintain the security. Witness the hacking of Experion, TRW, Walmart, etc. all of which had excellent security, but were compromised by humans failing to maintain the security.

As for maintaining value, there is NOTHING of value backing up any of the cryptocurrencies. All there is are electrons which are essentially worthless. Real currencies are tied to something of value, like gold, silver, or other assets backed by governments. Net result is a wildly fluctuating market that can be manipulated at will by those with money, essentially a Ponzi scheme.

for the process used to made them, i think bitcoin.