This is an exercise in secure symmetric-key encryption, implemented in purePython (only built-in libraries used), expanded from Bo Zhu's (http://about.bozhu.me)AES-128 implementation at https://github.com/bozhu/AES-Python

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Python Generate 256 Bit Key Fob

Mar 12, 2012  How to generate a secret key with Python. GitHub Gist: instantly share code, notes, and snippets. How to generate a secret key with Python. GitHub Gist: instantly share code, notes, and snippets. Skip to content. All gists Back to GitHub. Sign in Sign up Instantly share code, notes, and snippets.

• AES-128, AES-192 and AES-256 implementations in pure python (very slow, butworks).Results have been tested against the NIST standard (http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf)
• CBC mode for AES with PKCS#7 padding (now also PCBC, CFB, OFB and CTR thanks to @righthandabacus!)
• encrypt and decrypt functions for protecting arbitrary data with apassword

Note: this implementation is not resistant to side channel attacks.

Although this is an exercise, the encrypt and decrypt functions shouldprovide reasonable security to encrypted messages. It ensures the data iskept secret (using AES), blocks are encrypted together (CBC), the samemessage encrypted twice will have different ciphertexts (salt), the ciphertexthasn't been tampered with (HMAC) and the key has some defense against brute-force(PBKDF2).

The algorithm is as follows:

1. 16 random bytes of salt are extracted from the system's secure random numbergenerator (usually /dev/urandom)>

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2. The given master key is stretched and expanded by PKBDF2-HMAC(SHA256) usingthe salt from 1), to generate the AES key, HMAC key and IV (initializationvector for CBC).

3. The given message is encrypted with AES-128 using the AES key and IV fromstep 2), in CBC mode and PKCS#7 padding.

4. A HMAC-SHA256 is generated from the concatenation of the salt from 1) andthe ciphertext from 3).

5. The final ciphertext is HMAC + salt + ciphertext.

Security overview:

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• The random salt ensures the same message will map to different ciphertexts.

• The HMAC ensures the integrity of both the entire ciphertext and the PKBDF2salt; encrypt-then-mac prevents attacks like Padding Oracle.

• Bytes from keys, iv and salt are not reused in different algorithms.

• PBKDF2 key stretching allows for relatively weak passwords to be used as AESkeys and be moderately resistant to brute-force, but sacrificing performance.

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Python Generate 256 Bit Key Free

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