Cryptography (not cryptology, which includes cryptography and cryptanalysis) is a study of encryption from a mathematical point of view. It is also used for secret communication, allowing the world to see an encrypted message in case someone listens, not letting the real word know. Only the intended recipient can read it. As you mentioned, you can also “register” things with a similar scheme, but where “pre-decrypt” (my term) is something, and other people linking your cryptographic key can show that you signed something.
Cryptography is thus used almost exclusively in security areas. You can only restrict people who have access to secret data. This is useful for messaging so that only paying customers can install the software and be responsible (at least trying to prevent people from “joking” with their phones.
It can also provide some security in other ways. Some “dark networks”, especially Freenet, do not censor information. Each user stores the data on their computer so deleting it doesn’t delete any data from the network. After downloading the report, it may be nearly impossible to delete it. In the case of illegal content, you can place it on a computer without knowledge. However, since it is encrypted, the judge should not be guilty of keeping the data on the computer, because not only is it impossible to prove that your computer hosts illegal content, but even if it can, it can. Do not use access unless you intentionally try to decrypt it through other illegal routes.
With Bitcoin you will also find cryptographic applications in:
Tahoe-LAFS (and other encrypted file storage systems)
PGP / GPG (Plain text encryption so you can send emails to people without other people reading the message)
Finally, I will say that unique passwords can be a growing trend. I have a keychain that, to connect to the program, every time I need a new password. Only 64,000 random passwords are verified as “I am”, so the attacker cannot access the passwords, but cannot steal the password they use and reuse. Once applied, it cannot be used again.
Use of cryptography
The gist of what you’ve learned so far is that cryptography is the art of storing and writing information in such a way that it reveals itself only to those who need to see it. Hide from everyone else. Before the information age, cryptography was only used to ensure the secrecy of the information. Encryption has been used to ensure the confidentiality of spy communications, military leaders and diplomats. Egyptian hieroglyphs, scythe passwords used by Spanish Spartans, plaster and various physical tools were used throughout history and into modern times. These devices went through other changes as computers and electronic devices appeared, contributing significantly to cryptanalysis.
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