> Basically cryptography means secure plaintext replaced with it by some other thing and you should be able to make inverse replacation proccess as well (decryption) this function should be based on mathematical theories or methods.
Under your definition cryptographic hash algorithms [1] and digital signatures [2] are not cryptographic.
> I think you are not familiar with the cryptography concepts in general trends because today the most of data breaches become dangerous if the encrpyted part decrypts by the hackers, so that is why we should avoid typical approaches.
Your claim suggests that you are not familiar with cryptography at all. Modern cryptographic algorithms are parameterized with keys in a way that knowing the algorithm doesn't give adversaries much hint---you just have to keep keys safe. By comparison knowing that your algorithm is in use allows the complete decryption. This is...
> If you have an important data, you should protect it by an well-developed algorithm.
...what I referred by a "complex" approach. Existing algorithms are complex by themselves, but have well-defined interfaces and guarantees that you don't have to care about its innards. But rolling your own crypto means you have to care about its innards, thus more complex.
[1] https://en.wikipedia.org/wiki/Cryptographic_hash_function
[2] https://en.wikipedia.org/wiki/Digital_signature
Under your definition cryptographic hash algorithms [1] and digital signatures [2] are not cryptographic.
> I think you are not familiar with the cryptography concepts in general trends because today the most of data breaches become dangerous if the encrpyted part decrypts by the hackers, so that is why we should avoid typical approaches.
Your claim suggests that you are not familiar with cryptography at all. Modern cryptographic algorithms are parameterized with keys in a way that knowing the algorithm doesn't give adversaries much hint---you just have to keep keys safe. By comparison knowing that your algorithm is in use allows the complete decryption. This is...
> If you have an important data, you should protect it by an well-developed algorithm.
...what I referred by a "complex" approach. Existing algorithms are complex by themselves, but have well-defined interfaces and guarantees that you don't have to care about its innards. But rolling your own crypto means you have to care about its innards, thus more complex.
[1] https://en.wikipedia.org/wiki/Cryptographic_hash_function
[2] https://en.wikipedia.org/wiki/Digital_signature