Block-ciphers

Block ciphers
​DES algorithm video - 1​
​DES algorithm video - 2​
In order to understand hex and type parameters read Hash​
In order to understand encryption and decryption read Stream​
AES
​spec​
​AES algorithm video - 1​
​AES algorithm video - 2​
Description: Block cipher and AES winner.
Key:128, 192, 256 bits.
Iv: 128 bits.
Uses: General propuse, Performance is impportant, FIPS 197, NIST.
RC6
​spec​
Description: Block cipher and AES finalist.
Key: 128, 192, 256 bits.
Iv: 128 bits.
Uses: General propuse, alternative to AES.
MARS
​spec​
Description: Block cipher and AES finalist.
Key: 128, 192, 256 bits.
Iv: 128 bits.
Uses: General propuse, alternative to AES.
Twofish
​spec​
Description: Block cipher and AES finalist.
Key: 128, 192, 256 bits.
Iv: 128 bits.
Uses: General propuse, alternative to AES.
Serpent
​spec​
Description: Block cipher and AES finalist.
Key: 128, 192, 256 bits.
Iv: 128 bits.
Uses: General propuse, alternative to AES.
CAST-256
​spec​
Description: Block cipher and AES finalist.
Key: 256 bits.
Iv: 128 bits.
Uses: General propuse, alternative to AES.
Camellia
​spec​
Description: Block cipher, The cipher has been approved for use by the ISO/IEC, the European Union's NESSIE project, the Japanese CRYPTREC.
Key: 128, 192, 256 bits.
Iv: 128 bits.
Uses: General propuse, alternative to AES.
Speck128
​spec​
Key: 128, 192, 256 bits.
Iv: 128 bits.
Uses: IoT
Simeck64
​spec​
Key: 128 bits.
Iv: 64 bits.
Uses: IoT
Modes of Operation
​Modes of Operation video​
CTR
​spec​
Description: Block cipher mode
Uses: Performance is important.
GCM
​spec​
Description: Block cipher mode
Uses: Authenticated encryption.
It only support "type":"string"
It doesn't support "algorithm":"SIMECK64"
How to ???
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#!/usr/bin/env python
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​
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import requests
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import json
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import os,binascii
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​
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def sending(message):
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    url = 'http://127.0.0.1:6613/'
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    response = requests.post(url, data=message)
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    print response.content
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    return response.content
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​
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def stream(data_js):
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    req=json.loads(data_js)
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    print "Enc \n " + json.dumps(req) +"\n"
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    data_js_n=sending(json.dumps(req))
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    answ=json.loads(data_js_n)
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    print "Recived enc: \n" + (json.dumps(answ)) +"\n\n\n"
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    dec='{"algorithm":"AES","plaintext":"","iv":"b05691ef92cb9c9bb05691ef92cb9c9b",\
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    "version":1,"key":"b05691ef92cb9c9bb05691ef92cb9c9b","operation":"dec","type":"string", "mode":"ctr"}'
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    req=json.loads(dec)
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    req["plaintext"]=answ["result"]
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    print "Dec \n " + json.dumps(req) +"\n"
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    data_js_n=sending(json.dumps(req))
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    answ2=json.loads(data_js_n)
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    print "Recived dec: \n" + (json.dumps(answ2)) +"\n\n\n"
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​
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​
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data_js='{ "version": 1 , "algorithm":"AES" , "type":"string", "plaintext": "Hello world!", "hex": 0,"operation":"enc",\
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"key":"b05691ef92cb9c9bb05691ef92cb9c9b","iv":"b05691ef92cb9c9bb05691ef92cb9c9b", "mode":"ctr" }'
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stream(data_js)
Copied!
In this example we encrypt and decrypt Hello world! string using AES with the key and iv given in CTR mode.
On datajs["algorithm"] can be one of {AES, RC6, MARS, Twofish, SERPENT, CAST256, CAMELLIA, SPECK128, SIMECK64 }_
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#!/usr/bin/env python
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​
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import socket
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import json
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import os,binascii
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​
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def sending(message):
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    ip = '127.0.0.1'
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    port = 6613
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    BUFFER_SIZE = 65536
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    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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    s.connect((ip, port))
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    s.send(message)
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    data = s.recv(BUFFER_SIZE)
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    s.close()
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    return data
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​
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def stream(data_js):
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    req=json.loads(data_js)
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    print "Enc \n " + json.dumps(req) +"\n"
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    data_js_n=sending(json.dumps(req))
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    answ=json.loads(data_js_n)
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    print "Recived enc: \n" + (json.dumps(answ)) +"\n\n\n"
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    dec='{"algorithm":"AES","plaintext":"","iv":"b05691ef92cb9c9bb05691ef92cb9c9b",\
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    "version":1,"key":"b05691ef92cb9c9bb05691ef92cb9c9b","operation":"dec","type":"string", "mode":"gcm" ,"adata":"ABCD"}'
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    req=json.loads(dec)
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    req["plaintext"]=answ["result"]
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    print "Dec \n " + json.dumps(req) +"\n"
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    data_js_n=sending(json.dumps(req))
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    answ2=json.loads(data_js_n)
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    print "Recived dec: \n" + (json.dumps(answ2)) +"\n\n\n"
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​
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​
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data_js='{ "version": 1 , "algorithm":"AES" , "type":"string", "plaintext": "Hello world!", "hex": 0,"operation":"enc",\
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"key":"b05691ef92cb9c9bb05691ef92cb9c9b","iv":"b05691ef92cb9c9bb05691ef92cb9c9b", "mode":"gcm" ,"adata":"ABCD"}'
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stream(data_js)
Copied!
In this example we encrypt and decrypt Hello world! string using AES with the key,iv,adata given in GCM mode.
On datajs["algorithm"] can be one of {AES, RC6, MARS, Twofish, SERPENT, CAST256, CAMELLIA, SPECK128}_
Json to enc string (key and iv depends on algorithm you chose) in CTR mode
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{ "version": 1 , "algorithm":"block flavor" , "type":"string", "plaintext": "your string", "hex":BOOL,
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"operation":"enc", "key":"Hex stringsize=32-64","iv":"Hex stringsize=16-32", "mode":"ctr"}
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Json to dec string (key and iv depends on algorithm you chose) in CTR mode
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{ "version": 1 , "algorithm":"block flavor" , "type":"string", "plaintext": "your hex enc string ", 
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"operation":"dec", "key":"Hex stringsize=32-64","iv":"Hex stringsize=16-32", "mode":"ctr"}
Copied!
To enc/dec a file you need to change "type":"string" -> "type":"file" , "plaintext": "your hex enc string " -> "file":"your file"
To use enc/dec GCM mode you need to change "mode":"ctr"->"mode":"gcm" , add "adata":"your string" and "hex" parameters
"hex" parameter apply for "string" and "adata" parameter
Stream-ciphers
HMAC
Last modified 10mo ago
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