cryptopals

commit 469d63f8a0571fe80dc545235dd8e11b955dfa4a
parent d85b31355c22108c59285856e103d9f9def67992
Author: mpizzzle <michael.770211@gmail.com>
Date:   Wed,  1 Nov 2017 08:40:34 +0000

temp commit

Diffstat:
M
set3/aes_in_ctr_mode.py
 | 
3
++-
A
set3/break_fixed_nonce_ctr_using_substitutions.py
 | 
11
+++++++++++
A
set3/files/19.txt
 | 
40
++++++++++++++++++++++++++++++++++++++++

3 files changed, 53 insertions(+), 1 deletion(-)
diff --git a/set3/aes_in_ctr_mode.py b/set3/aes_in_ctr_mode.py
@@ -1,5 +1,5 @@
 from Crypto.Cipher import AES
-
+from Crypto.Util import Counter
 ciphertext = "L77na/nrFsKvynd6HzOoG7GHTLXsTVu9qvY/2syLXzhPweyyMTJULu/6/kXX0KSvoOLSFQ==".decode("base64")
 key = "YELLOW SUBMARINE"
 nonce = ''.join(['\x00' for i in range(AES.block_size / 2)])
@@ -16,3 +16,4 @@ def encrypt(ciphertext, key, nonce):
     return plaintext
 
 print encrypt(encrypt(encrypt(ciphertext, key, nonce), key, nonce), key, nonce)
+print AES.new(key, AES.MODE_CTR, counter=Counter.new(64,initial_value=0,little_endian=True,prefix=nonce)).encrypt(ciphertext)
diff --git a/set3/break_fixed_nonce_ctr_using_substitutions.py b/set3/break_fixed_nonce_ctr_using_substitutions.py
@@ -0,0 +1,11 @@
+from Crypto.Cipher import AES
+from Crypto import Random
+from Crypto.Util import Counter
+
+key = Random.new().read(AES.block_size)
+
+with open('files/19.txt') as f:
+    ciphertexts = [AES.new(key, AES.MODE_CTR, counter=Counter.new(64,initial_value=0,little_endian=True,prefix="\x00\x00\x00\x00\x00\x00\x00\x00")).encrypt(line) for line in f.read().splitlines()]
+
+for ct in ciphertexts:
+    print ct
diff --git a/set3/files/19.txt b/set3/files/19.txt
@@ -0,0 +1,40 @@
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+Q29taW5nIHdpdGggdml2aWQgZmFjZXM=
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+SGVyIG5pZ2h0cyBpbiBhcmd1bWVudA==
+VW50aWwgaGVyIHZvaWNlIGdyZXcgc2hyaWxsLg==
+V2hhdCB2b2ljZSBtb3JlIHN3ZWV0IHRoYW4gaGVycw==
+V2hlbiB5b3VuZyBhbmQgYmVhdXRpZnVsLA==
+U2hlIHJvZGUgdG8gaGFycmllcnM/
+VGhpcyBtYW4gaGFkIGtlcHQgYSBzY2hvb2w=
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+QSB0ZXJyaWJsZSBiZWF1dHkgaXMgYm9ybi4=