Hackexercise #2

Problem Statement
Brute-force the following Caesar’s cipher, and find the plaintext and key of the following message: kyvtrmrcipnzccrkkrtbwifdkyvefikynvjkrkeffe

Solution

alphabet = "abcdefghijklmnopqrstuvwxyz"

def encrypt(plaintext, k):
    ciphertext = []
    for c in plaintext:
        i = alphabet.index(c)
        j = (i + k) % len(alphabet)
        ciphertext.append(alphabet[j])
    return ''.join(ciphertext)

def decrypt(ciphertext, k):
    return encrypt(ciphertext, -k)
    
def brute_force(ciphertext):
    for i in range(0, len(alphabet)):
        print(i, decrypt(ciphertext, i))
    

brute_force("kyvtrmrcipnzccrkkrtbwifdkyvefikynvjkrkeffe")

Hackexercise #1

Problem Statement
The function check_password(password) is used by a safe with 4-digits passwords, and is susceptible to timing attacks. More specifically, it takes it around 0.1 seconds to check one digit – so brute-forcing all the possible combinations will take around 1,500 hours. Can you implement a way to crack its password in less than a minute?


import time
import sys # ignore
sys.path.insert(0,'.') # ignore
from Root.pswd import real_password

def check_password(password): # Don't change it
    if len(password) != len(real_password):
        return False
    for x, y in zip(password, real_password):
        time.sleep(0.1) # Simulates the wait time of the safe's mechanism
        if int(x) != int(y):
            return False
    return True

def crack_password():
    password=[0,0,0,0]
    result=''
    
    for a in range(0,9):
        password[0] = a
        starti= time.time()
        check_password(password)
        end= time.time()
        if(end - starti >= 0.2):
            result += str(a)
            break
     
    for b in range(0,9):
        password[1] = b
        starti= time.time()
        check_password(password)
        end= time.time()
        if(end - starti >= 0.3):
            result += str(b)
            break
        
    for c in range(0,9):
        password[2] = c
        starti= time.time()
        check_password(password)
        end= time.time()
        if(end - starti >= 0.4):
            result += str(c)
            break
    
    for d in range(0,9):
        password[3] = d
        check_password(password)
        if(check_password(password)):
            result += str(d)
            break
        
    return(result)
        
print(crack_password())

What i am doing in 2020

Done so far:

1. Data Science - Udacity Bertelsman Scholarship (16 March)
2. Pluralsight - Ethical Hacking: Understanding Ethical Hacking
3. Pluralsight - Exploring Your First Data Set with R
4. Pluralsight - Introduction to Data Science in R (Conference - 50 minutes)
5. Pluralsight - Querying and Converting Data Types in R
6. Pluralsight - Learning R through Sports, or Learning Sports through R: CodeMash
7. Pluralsight - Importing Formatted Text Files: R Playbook
8. Security+ Book
9. Covid-19 Course - Coursera (John Hopkins)
10. The Modern World, Part Two: Global History since 1910 (University of Virginia)
11. The Data Scientist's Toolbox (John Hopkins University)
12. R Programming (John Hopkins University)

Movies - Seen

1. Marriage Story (2019)
2. Shaft (2019)
3. Always be my maybe (2019)
4. The long goodbye (1973)
5. The Guard (2011)
6. Seems like old times (1980)
7. Little men (2016)
8. Palmeras en la Nieve (2015)
9. Midway (2019)
10. A beautiful day in the neighborhood (2019)
11. 21 Bridges (2019)
12. Ready or Not (2019)
13. Gloria Bell (2018)
14. Motherless Brooklyn (2019)
15. Terminator - Dark Fate (2019)
16. Bombshell (2019)
17. Page Eight (2011)
18. Underwater (2020)
19. 1917 (2019)
20. Shazam (2019)
21. Έτερος Εγώ - The Other Me (2016)
22. Extraction (2020)
23. The Call of the Wild (2020)
24. Americal Animals (2018)
25. The Way Back (2020)
26. The Gentlemen (2019)
27. Jojo Rabbit (2019)
28. Misbehaviour (2020)
29. Pas son genre (2014)
30. Stronger (2017)
31. Τσίου (2005)
32. Knives Out (2019)
33. Guardians of the Galaxy Part.2 (2017)
34. The Goldfinch (2019)
35. The Lovebirds (2020)
36. San Hijos (2015)
37. The Florida Project (2017)
38. Maigret in Montmartre (2017)
39. Transsiberian (2008)
40. Ευτυχία (2019)
41. Moglie e Marito (2017)
42. Rampart (2011)
43. Momenti di trascurabile felicità (2019)
44. Il campione (The Champion) (2019)
45. Decision at Sundown (1957)
46. Breakheart pass (1974)
47. Greyhound (2020)
48. The art of racing in the rain (2019)
49. Ford vs Ferrari (2019)
50. Marshall (2017)
51. Heroic Losers (2019)
52. The brand new testament (2015)
53. Manchester by the sea (2016)
54. The Outpost (2020)
55. The King of Staten Island (2020)
56. Eurovision Song Contest: The Story of Fire Saga (2020)
57. Eyewitness (1981)
58. Race (2016)
59. Official Secrets (2019)
60. Da 5 Bloods (2020)
61. Good Boys (2019)
62. Adults in the room (2019)
63. Arkansas (2020)
64. The High Note (2020)
65. Operation Finale (2018)
66. Paterson (2016)
67. Vice (2018)
68. Love and Mercy (2014)
69. Joker (2019)
70. The Doorman (2020)
71. Sole a Catinelle (2013)
72. The Wolf of Snow Hollow (2020)
73. Love and Monsters (2020)
74. Palm Springs (2020)
75. Holidate (2020)
76. Under the Tuscan Sun (2003)
77. La Corrispondenza (2016)
78. Le Week-End (2013)
79. On the Rocks (2020)
80. The Spy (2019) - Spionen
81. Harvest Moon (2015)
82. Let Him Go (2020)
83. Christmas with the Kranks (2004)
84. Honest Thief (2020)
85. Aquaman (2018)
86. Last Christmas (2019)

Series - Seen

1. Mrs.Fletcher
2. Seinfeld - Season 5
3. Narcos - Mexico
4. Mindhunters - Season 2
5. The Morning Show - Season 1
6. The Fabulous Mrs.Maisel
7. Stranger Things - Season 4
8. Better Call Saul - Season 5
9. Seinfeld - Season 6
10. Designated Survivor - Season 1
11. Designated Survivor - Season 2 (up to episode 4)
12. Fleabag - Season 1
13. Tedd Lasso - Season 1
14. Emily in Paris - Season 1
15. Queen's Gambit - Season 1
16. The Flight Attendant - Season 1
17. Defending Jacob (2019)
18. Catastrophe - Season 1 (up to episode 3)
19. Spy (2011) - Episode 1

Books - Read

1. ein Hundekrimi - Hueber
2. Ο θησαυρός της Βαγίας - Ζωρζ Σαρρή
3. The Lemonade Life
4. Security+
5. Ο Πήτερ Παν πρέπει να πεθάνει
6. Διόδια - Βαγγέλης Ραπτόπουλος
7. Πλάτωνας, όχι Πρόζακ

 Recipes

1. Αλευρόπιτα
2. Κολοκυθοκεφτέδες με ντιπ γιαουρτιού
3. Κολοκυθοκορφάδες με τυράκι στο τηγάνι
4. Ρουμελιώτικη τυρόπιτα
5. Πάστα φλώρα
6. Μύδια Σαγανάκι
7. Γαρίδες με μουστάρδα, μέλι και βαλσάμικο για σαλάτα
8. Occhi di Bue
9. Φασόλια χάντρες

Music

1. In the wee small hours of the morning - Frank Sinatra
2. the Odd Couple - Hefti
3. Feeling blue - Paul Desmond (1996)
4. Back at the Chicken Shack - Jimmy Smith

What to print, Download and buy

• Articulate Storyline
• Adobe Captivate
• Lectora
• ExeLearning
• Things aren't what they used to be (Ella Fitzgerald)

What I did in 2019

Quotes of the Year

For every complex problem there is an answer that is clear, simple and wrong.

H.L.Mencken

What I have already done:

1. CCNP Route Recertification (300-101)
2. Coursera - Introduction to the Internet of Things and Embedded Systems, by University of California, Irvine
3. Coursera - The Raspberry Pi Platform and Python Programming for the Raspberry Pi, by University of California, Irvine
4. Edx - Data Science: R Basics - HarvardX
5. Coursera - Hacking Exercise, McMaster University
6. Cooking
1. Μεσογειακό Κέικ με λάδι και γιαούρτι
2. Κέικ Σοκολάτας με σοκολάτα
3. Γαλατόπιτα
4. Muffins με διπλή σοκολάτα
5. Muffins Μπανάνας
6. Γαρίδες Σαγανάκι
7. Ψωμί με μπύρα
8. Ρύζι
9. Μακαρόνια με σάλτσα ντομάτας (+μανιτάρια)
10. Τορτελίνια με καπνιστό σολωμό και βότκα

Movies

1. Mile 22 (2018)
2. Teleioi Xenoi (2017)
3. Juliet Naked (2018)
4. The Meg (2018)
5. Ant-Man and the Wasp (2018)
6. Asher (2018)
7. Darkest Hour (2017)
8. Avengers: Infinity War (2018)
9. Buchanan Rides Alone (1958)
10. Black Panther (2018)
11. Ladies in Black (2018)
12. The Favourite (2018)
13. Overlord (2018)
14. Justice League (2017)
15. Green Book (2018)
16. Little Italy (2018)
17. Braven (2018)
18. Widows (2018)
19. King of Thieves (2018)
20. Triple Frontier (2019)
21. The Bookshop (2017)
22. Escape room (2019)
23. 12 Angry Men (1957)
24. How to train your Dragon: The Hidden World (2019)
25. Waffle street (2015)
26. The Wife (2017)
27. Detroit (2017)
28. Cold Pursuit (2019)
29. On the basis of sex (2018)
30. Mamma Mia! Here We Go Again (2018)
31. The Mule (2018)
32. Hunter Killer (2018)
33. The Bouncer - (a.k.a. Lukas) (2018)
34. Murder Mystery (2019)
35. Gold (2016)
36. Triple Threat (2019)
37. Hotel Mumbai (2018)
38. Destroyer (2018)
39. The Standoff at Sparrow Creek (2018)
40. 12 Strong (2018)
41. Crypto (2019)
42. Aladdin (2019)
43. Fury (2014)
44. The Aftermath (2019)
45. Mirage (Durante la Tormenta) (2018)
46. Everybody Knows (2018)
47. Flip that Romance (2019)
48. The Perfect Date (2019)
49. First Man (2018)
50. Life (2017)
51. Shoplifters (2018)
52. Bohemian Rhapsody (2018)
53. Searching (2018)
54. Daglicht (2013)
55. Logan Lucky (2017)
56. Captain Marvel (2019)
57. Ben is Back (2018)
58.  A simple favor (2018)
59. Avengers Endgame (2019)
60. Godzilla: King of the Monsters (2019)
61. Miss Sloane (2016)
62. Can you keep a secret (2019)
63. John Wick: Chapter 3 - Parabellum (2019)
64. Yesterday (2019)
65. The Negotiation (2019)
66. The art of self-defence (2019)
67. Long Shot (2019)
68. Murder on the Orient Express (2017)
69. Dunkirk (2017)
70. El Camino A Breaking Bad Movie (2019)
71. American Assasin (2017)
72. Once Upon a Time... in Hollywood (2019)
73. The Irishman (2019)
74. Fast and Furious Presents: Hobbs and Shaw (2019)
75. The Farewell (2019)
76. The Spy who dumped me (2018)
77. To All the Boys I've Loved Before (2018)
78. X-men: Dark Phoenix (2019)
79. In the shadow of the moon (2019)
80. Crawl (2019)

Series

1. Community - Season 6
2. House of Cards - Season 6
3. Okkupert - Season 1
4. Better Call Saul - Season 4
5. Suits - Season 5 
6. Suits - Season 6
7. Godless
8. Dr.Foster - Season 1
9. Silicon Valley - Season 6 - Series Finale
10. Seinfeld - Season 1
11. Seinfeld - Season 2
12. Seinfeld - Season 3
13. Seinfeld - Season 4
14. Rick and Morty - Season 1
15. True Detective - Season 3
16. Casa de Papel - Season 1
17. The Mandalorian - Season 1
18. Seinfeld - Season 5 (up to episode 5)
19. Mrs.Fletscher (up to episode 2)
20. Narcos Mexico (up to episode 2)

Books

1. Ένα δέντρο μεγαλώνει στο Brooklyn - Betty Smith
2. Dory Dory Black Sheep - Abby Hanlon
3. Stepping into the magic - Gill Edwards
4. Origin - Dan Brown
5. Body by Science: A Research-Based Program for Strength Training, Body Building, and Complete Fitness in 12 Minutes a Week (Little, McGuff)
6. Πώς λειτουργεί ο κόσμος - Noam Chomsky
7. The 4-Hour Body: An Uncommon Guide to Rapid Fat-Loss, Incredible Sex, and Becoming Superhuman - Timothy Ferris
8. Χαρταετοί της Νύχτας - Night Kites (M.E.Ker) - Madelein Meaker
9. Παλιά πολύ παλιά - Πέτρος Μάρκαρης
10. Ο τσε αυτοκτόνησε - Πέτρο Μάρκαρης
11. Η προμήθεια - Τζωρτζ Πελεκάνος
12. Σάββατο βράδυ στην άκρη της πόλης - Σώτη Τριανταφύλλου
13. Amsterdam - Ian McEwan

Το soundtrack του βιβλίου "Τελευταίο τραγούδι για τον Ρέμπους" του Ίαν Ράνκιν

είναι τα τραγούδια που ακούει ο επιθεωρητής Ρέμπους στη διάρκεια του μυθιστορήματος. Ας τα ακούσουμε λοιπόν:

1. Steven Lindsay - Submarine
2. John Hiatt - Lift up Every Stone
3. Razorlight - Golden Touch
4. Primal Scream - Sometimes I Feel So Lonely
5. Randy Newman - Jolly Coppers on Parade
6. Randy Newman - You Can't Fool The Fat Man
7. King Crimson - Moonchild
8. Peter Hammill - If I Could
9. Caravan - In the Land of Grey and Pink
10. Pentangle - Light Flight
11. Bert Jansch & John Renbourn - Stepping Stones
12. The Velvet Underground - The Gift
13. The Who - Endless Wire
14. Johnny Cash - San Quentin (Live from Prison)
15. John Martyn - Some People Are Crazy
16. John Martyn - Grace and Danger
17. John Martyn - Johnny Too Bad
18. Talking Heads - Cities
19. Rory Gallagher - Big Guns
20. Rory Gallagher - Bad Penny
21. Rory Gallagher - Kickback City
22. Rory Gallagher - Sinner Boy
23. Leonard Cohen - Don't Go Home With Your Hard-on 
24. Leonard Cohen - True Love Leaves No Traces

What I did in 2018

Lifelong Learning:

1. Memrise - Italian Language and Culture : Beginner (Completed)
2. CyberSecurity Essentials - Rochester Institute of Technology (RITx - Edx)
3. A Crash Course in Data Science - John Hopkins University (Coursera)
4. Work Smarter, Not Harder: Time Management for Personal and Professional Productivity - University of California, Irvine (Coursera)
5. Introduction to Data Science (Microsoft - Edx)
6. Healthy Aging (Delftx - Edx)
7. Business Communication (RITx - Edx)
8. Enterprise Security Fundamentals (INF246x - Microsoft - Edx)
9. Shell Workshop (Udacity)

Movies

1. Touch of Evil (1958)
2. Elle (2016)
3. Dossier K (2009)
4. Snowman (2017)
5. Bright (2017)
6. The Foreigner (2017)
7. The Mountain Between Us (2017)
8. Geostorm (2017)
9. Quartet (2012)
10. Renegades (2017)
11. Marnie (1964)
12. The Legend of Tarzan (2017)
13. Focus (2015)
14. Lessons in love (2013)
15. Three billboards outside Ebbing, Missouri (2017)
16. La piel que habito (2011) - Almodovar
17. Κοινός Παρονομαστής (2014)
18. Wonder Wheel (2017)
19. Shot Caller (2017)
20. Irrational Man (2015)
21. Star Wars: The Last Jedi (2017)
22. The shape of water (2017)
23. Annihilation (2018)
24. Game night (2018)
25. About a Girl (2014)
26. Red Sparrow (2018)
27. The Kissing Booth (2018)
28. Crooked House (2017)
29. Gringo (2018)
30. Lady Bird (2017)
31. Death Wish (2018)
32. Borg vs McEnroe (2017)
33. The Vow (2012)
34. Man of the year (2006)
35. Suicide Squad (2016)
36. Foxcatcher (2014)
37. Set it Up (2018)
38. Den of Thieves (2018)
39. Tomb Raider (2018)
40. Playing It Cool (2014)
41. When we first met (2018)
42. Rampage (2018)
43. About Last Night (2014)
44. Wonder (2017)
45. All the money in the world (2017)
46. Forever My Girl (2018)
47. Office Space (1999)
48. Murder on the Orient Express (2017)
49. Hotel Transylvania 2 (2015)
50. Thanks for Sharing (2012)
51. Mike and Dave need wedding dates (2016)
52. The spectacular now (2013)
53. Hellboy 2 (2008)
54. Beirut (2018)
55. Atomic Blonde (2017)
56. This is where i leave you (2014)
57. Lawman (1971)
58. Showdown (1963)
59. The Last Kiss (2006)
60. People like us (2012)
61. Tully (2018)
62. Adrift (2018)
63. Jurassic World: Fallen Kingdom (2018)
64. Destination Wedding (2018)
65. Lost in Paris (2016)
66. The Breaking Point (1950)
67. Kodachrome (2017)
68. Young Billy Young (1969)
69. Solo: A Star Wars Story (2018)
70. Ocean's eight (2018)
71. Mission Impossible: The Fallout (2018)
72. Skyscrapper (2018)
73. Crazy Rich Asians (2018)
74. Singin' in the Rain (1952)
75. The Equalizer 2 (2018)
76. Overboard (2018)
77. Sicario: Day of the Soldado (2018)
78. Deadpool 2 (2018)
79. Mary Poppins Returns (2018)
80. The Grinch (2018)

Series

1. The Wire - Season 4
2. The Wire - Season 5
3. Stranger Things - Season 2
4. Homeland - Season 2
5. Homeland - Season 3
6. Homeland - Season 4
7. Homeland - Season 5
8. Homeland - Season 6
9. Homeland - Season 7
10. Dark - Season 1
11. Mr.Robot - Season 2
12. WestWorld - Season 2
13. Barry - Season 1
14. Mindhunters - Season 1
15. Silicon Valley - Season 1
16. Ozark - Season 2
17. Tom Clancy's Jack Ryan - Season 1
18. Crisis in six scenes - Woody Allen
19. Genius - Season 1 - Albert Einstein
20. Hooten and the Lady - Season 1
21. Silicon Valley - Season 2
22. Silicon Valley - Season 3
23. Silicon Valley - Season 4
24. Silicon Valley - Season 5
25. Berlin Station - Season 2
26. Homecoming - Season 1
27. Community - Season 4
28. Community - Season 5

Books

1. OffShore - Πέτρος Μάρκαρης
2. Η απολογία ενός ανθέλληνα - Νίκος Δήμου
3. Modern Greece: What everybody needs to know - Stathis Kalivas
4. Νυχτερινό Δελτίο - Πέτρος Μάρκαρης
5. Ο Αναρχικός Τραπεζίτης - Φερνάντο Πεσσόα
6. Ο Τροπικός του Αιγόκερω - Χένρυ Μίλλερ
7. Ο κολοσσός του Μαρουσιού - Χένρυ Μίλλερ
8. Ο πίνακας της Φλάνδρας - Αρτούρο Πέρεθ Ρεβέρτε
9. Τελευταίο τραγούδι για τον Ρέμπους - Ίαν Ράνκιν
10. Σκέψου έναν αριθμό - Τζον Βέρντον
11. Because the night - James Ellroy
12. Η Ρωμαϊκή άνοιξη της κας.Στόουν και άλλες ιστορίες - Τένεσι Ουίλιαμς
13. Down by the River Where the Dead Men go - George Pelecanos
14. The book of laughter and forgetting - Milan Kuntera

Battery not charging - Lenovo Z710

Να και το πρόβλημα της ημέρας.

Ολοκαίνουριος υπολογιστής έμεινε ανενεργός και εκφορτίστηκε η μπαταρία του. Όταν τον συνέδεσα στο ρεύμα και τον ξεκίνησα, δεν φόρτιζε τη μπαταρία του. Μετά από ψάξιμο στο Internet η λύση ήταν:

1. Μπαίνουμε στο BIOS (εκκίνηση και Fn+F2)
2. Όσο είμαστε στο BIOS αφαιρούμε το καλώδιο τροφοδοσίας οπότε ο υπολογιστής "κρασάρει".
3. Ξεκινάμε και βλέπουμε την μπαταρία να φορτίζει και πάλι.

Καλό μας κουράγιο.