02 2021 档案
摘要：Security and Cryptography in Python - Hash Functions(2) Digital Signatures works - uses hash functions https://en.wikipedia.org/wiki/RSA_(cryptosystem
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摘要：Security and Cryptography in Python - Hash Functions(1) Properties of a Hash Function It is an one-way deterministic function The output is dependent
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摘要：Security and Cryptography in Python - Public Key Encryption Systems - RSA（3） Wrong use of RSA Breaks it import math import random def is_prime(p): for
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摘要：Security and Cryptography in Python - Public Key Encryption Systems - RSA（2） The security of RSA and Implement an Attack import math import random def
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摘要：Security and Cryptography in Python - Public Key Encryption Systems - RSA（1） RSA - 1977 Key generation p,q ← primes n = p * q ← modulus e ← exponent d
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摘要：Security and Cryptography in Python - Key Exchange(4) Implementing Differ-Hellman Key Exchange import math import random def is_prime(p): for i in ran
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摘要：Security and Cryptography in Python - Key Exchange(3) Diffie–Hellman key exchange: https://en.wikipedia.org/wiki/Diffie%E2%80%93Hellman_key_exchange P
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摘要：Security and Cryptography in Python - Key Exchange(2) def is_prime(p): for i in range(2, p): if p % i == 0: return False return True print(is_prime(7)
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摘要：Security and Cryptography in Python - Key Exchange(1) # 14 + 15 mode 12 val = (14 + 15) % 12 print(val) # 4 * 5 mode 12 val = (4 * 5) % 12 print(val)
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摘要：Security and Cryptography in Python - Block Cipher(3)
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摘要：Security and Cryptography in Python - Block Cipher(2) Double DES from pyDes import * import random message = "01234567" key_11 = random.randrange(0, 2
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摘要：Security and Cryptography in Python - Block Cipher(1) DES https://en.wikipedia.org/wiki/Data_Encryption_Standard GOST https://en.wikipedia.org/wiki/GO
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摘要：Security and Cryptography in Python - Stream Ciphers（5） Stream Cipher in Real Life - A5/1 Linear Feedback Shift Registers(LFSR)
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摘要：Security and Cryptography in Python - Stream Ciphers（4） Low entropy - Brute force of our Stream Cipher import random class KeyStream: def __init__(sel
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摘要：Security and Cryptography in Python - Stream Ciphers（3） The problem of re-use of keys in Stream Ciphers import random class KeyStream: def __init__(se
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摘要：Security and Cryptography in Python - Stream Ciphers（2） Implementation of the Authenticity problem with Stream Ciphers import random class KeyStream:
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摘要：Security and Cryptography in Python - Stream Ciphers（1） The practical implementations of One Time Pads Real-life One Time Pad? 1Gb message requires 1G
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摘要：Security and Cryptography in Python - One Time Pad XOR Example def xor(x, s): print(x, 'xor', s, '=', x^s) def xorb(x, s): print(bin(x), 'xor', bin(s)
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摘要：Security and Cryptography in Python - Frequency Analysis Frequency Analysis cipher = """lrvmnir bpr sumvbwvr jx bpr lmiwv yjeryrkbi jx qmbm wi bpr xjv
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摘要：Security and Cryptography in Python - Substitution Cipher A Substitution Cipher has possible permutations / po
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摘要：Security and Cryptography in Python - Check the performance and understand how fast the space of permutations grows def faculty(n): if n <= 1: return
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摘要：Security and Cryptography in Python - Implementing a counter on how many permutations there are from itertools import permutations my_list = [1, 2, 3]
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