Is the encryption hard to decipher?

Question

Encryption

Good afternoon!
I was given the task to encrypt the numbers so that no one would guess which numbers are encrypted.
www.lynix.ru/code.php
This page contains the encryption itself. On the first line - the number itself, the second - the cipher, the third - the decryption of the cipher (for the test, whether the number was deciphered correctly).

Tell me if I encrypted the numbers enough? Is it difficult to guess the encryption method?

Answer 1

Too much redundant data in your encryption turned out))
It's hard to guess (and if it's your own algorithm, then most likely it's not possible), if only because there are no repeated letters in your message.
Your message is rather short, why not encrypt it using the same XOR with a key length greater than/equal to the message length? With such a key length, the cipher is unbreakable (provided that the attacker does not know the key).

Answer 2

It seems to me enough, but it is very easy to conclude that the result depends on time.

Answer 3

It is impossible to determine the quality of encryption by one example.
Give all encryptions for numbers from 0 to 999999999. A black box is even better: the input is a number, the output is an encryption. (for example, on the same input page with a button) Then it will be possible to judge the quality of encryption: is it well distributed, how does the size of encrypted data depend on unencrypted ...

Answer 4

Security by Obscurity?