The secrets concept (#3565)

* The `secrets` concept

* Edits and Link Additions

A few edits, and some additional links.

---------

Co-authored-by: BethanyG <BethanyG@users.noreply.github.com>

Author: colinleach

concepts/secrets/.meta/config.json

@@ -0,0 +1,5 @@
+{
+  "blurb": "The secrets module is a cryptographically-secure alternative to the random module, intended for security-critical uses.",
+  "authors": ["BethanyG", "colinleach"],
+  "contributors": []
+}

concepts/secrets/about.md

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+# About
+
+A previous concept discussed the [concept:python/random]() module, which produces [pseudo-random numbers][pseudo-random-numbers] and pseudo-random list orderings.
+
+The [`secrets`][secrets] module overlaps with `random` in some of its functionality, but the two modules are designed with very different priorities.
+
+- `random` is optimized for high performance in modelling and simulation, with "good enough" pseudo-random number generation.
+- `secrets` is designed to be crytographically secure for applications such as password hashing, security token generation, and account authentication.
+
+
+Further details on why the addition of the `secrets` module proved necessary are given in [PEP 506][PEP506].
+
+The `secrets` is relatively small and straightforward, with methods for generating random integers, bits, bytes or tokens, or a random entry from a given sequence.
+
+To use `scerets`, you mush first `import` it:
+
+
+```python
+>>> import secrets
+
+#Returns n, where 0 <=  n < 1000.
+>>> secrets.randbelow(1000) 
+577
+
+#32-bit integers.
+>>> secrets.randbits(32) 
+3028709440
+
+>>> bin(secrets.randbits(32))
+'0b11111000101100101111110011110100'
+
+#Pick at random from a sequence.
+>>> secrets.choice(['my', 'secret', 'thing']) 
+'thing'
+
+#Generate a token made up of random hexadecimal digits.
+>>> secrets.token_hex() 
+'f683d093ea9aa1f2607497c837cf11d7afaefa903c5805f94b64f068e2b9e621'
+
+#Generate a URL-safe token of random alphanumeric characters.
+>>> secrets.token_urlsafe(16) 
+'gkSUKRdiPDHqmImPi2HMnw'
+```
+
+
+If you are writing security-sensitive applications, you will certainly want to read the [full documentation][secrets], which gives further advice and examples.
+
+
+[PEP506]: https://peps.python.org/pep-0506/
+[pseudo-random-numbers]: https://www.khanacademy.org/computing/computer-science/cryptography/crypt/v/random-vs-pseudorandom-number-generators
+[secrets]: https://docs.python.org/3/library/secrets.html

concepts/secrets/introduction.md

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+# Introduction
+
+A previous concept discussed the [concept:python/random]() module, which produces [pseudo-random numbers][pseudo-random-numbers] and pseudo-random list orderings.
+
+The [`secrets`][secrets] module overlaps with `random` in some of its functionality, but the two modules are designed with very different priorities.
+
+- `random` is optimized for high performance in modelling and simulation, with "good enough" pseudo-random number generation.
+- `secrets` is designed to be crytographically secure for applications such as password hashing, security token generation, and account authentication.
+
+
+Further details on why the addition of the `secrets` module proved necessary are given in [PEP 506][PEP506].
+
+If you are writing security-sensitive applications, you will certainly want to read the [full documentation][secrets], which gives further advice and examples.
+
+[PEP506]: https://peps.python.org/pep-0506/[secrets]: https://docs.python.org/3/library/secrets.html
+[pseudo-random-numbers]: https://www.khanacademy.org/computing/computer-science/cryptography/crypt/v/random-vs-pseudorandom-number-generators
+[secrets]: https://docs.python.org/3/library/secrets.html

concepts/secrets/links.json

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+[
+  {
+    "url": "https://docs.python.org/3/library/secrets.html/",
+    "description": "The secrets module."
+  },
+  {
+    "url": "https://peps.python.org/pep-0506/",
+    "description": "PEP 506, giving reasons why the secrets module is necessary."
+  },
+  {
+    "url": "https://en.wikipedia.org/wiki/Pseudorandomness",
+    "description": "Wikipedia: Pseudorandomness."
+  },
+  {
+    "url": "https://www.khanacademy.org/computing/computer-science/cryptography/crypt/v/random-vs-pseudorandom-number-generators",
+    "description": "Khan Academy: Pseudorandom Number Generators."
+  }
+]

config.json

@@ -2582,6 +2582,11 @@
       "uuid": "000e7768-38b9-4904-9ae2-9a4e448f366c",
       "slug": "fractions",
       "name": "Fractions"
+    },
+    {
+      "uuid": "e1496136-8d58-4409-9a41-4b6ee4721c6b",
+      "slug": "secrets",
+      "name": "Secrets"
     }
   ],
   "key_features": [