Assertion Fails if input is under 49 chars long

[00-Python]

Encryption/Decryption Failure for Short Plaintexts (< 49 characters)

Description
The current cryptographic algorithm in hpc.py fails to decrypt short plaintexts (under 49 characters). While it successfully encrypts the input, the decryption process consistently results in an AssertionError: Decryption failed.

Proof
The provided proof demonstrates repeated failures in decryption for plaintexts of varying lengths below 49 characters. The output consistently shows a successful encryption process (text is permuted and converted into a cipher), followed by a decryption failure, despite the decryption process appearing to re-create the original matrix correctly. The script raises an AssertionError in each case.

Outputs

(venv) zero@zero:~/ (main)$ /home/zero/venv/bin/python /home/zero/hpc.py
Plaintext: This is asssss unique cryptographic cipher test!
Key for permutation: 32
Flat grid for permutation: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37]
Permuted flat grid: [9, 35, 7, 25, 6, 22, 3, 30, 15, 36, 23, 28, 13, 21, 8, 19, 37, 18, 31, 34, 12, 33, 26, 29, 27, 17, 11, 4, 2, 24, 1, 32, 16, 20, 10, 14, 5]
Original grid for encryption: [[1, 2, 3, 4], [5, 6, 7, 8, 9], [10, 11, 12, 13, 14, 15], [16, 17, 18, 19, 20, 21, 22], [23, 24, 25, 26, 27, 28], [29, 30, 31, 32, 33], [34, 35, 36, 37]]
Permuted grid for encryption: [[9, 35, 7, 25], [6, 22, 3, 30, 15], [36, 23, 28, 13, 21, 8], [19, 37, 18, 31, 34, 12, 33], [26, 29, 27, 17, 11, 4], [2, 24, 1, 32, 16], [20, 10, 14, 5]]
Text after padding: ['i', 'p', 'h', 'e', 'r', ' ', 't', 'e', 's', 't', '!']
Matrix created from text: [[84, 104, 105, 115], [32, 105, 115, 32, 97], [115, 115, 115, 115, 115, 32], [117, 110, 105, 113, 117, 101, 32], [99, 114, 121, 112, 116, 111], [103, 114, 97, 112, 104], [105, 99, 32, 99]]
Flattened matrix for encryption: [84, 104, 105, 115, 32, 105, 115, 32, 97, 115, 115, 115, 115, 115, 32, 117, 110, 105, 113, 117, 101, 32, 99, 114, 121, 112, 116, 111, 103, 114, 97, 112, 104, 105, 99, 32, 99]
Flat matrix converted to text: agsoc i Tctes ahpiuisisrscysr qp uhsn
Encrypted: agsoc i Tctes ahpiuisisrscysr qp uhsn
Encrypted length: 37
Key for permutation: 32
Flat grid for permutation: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37]
Permuted flat grid: [9, 35, 7, 25, 6, 22, 3, 30, 15, 36, 23, 28, 13, 21, 8, 19, 37, 18, 31, 34, 12, 33, 26, 29, 27, 17, 11, 4, 2, 24, 1, 32, 16, 20, 10, 14, 5]
Decryption original grid: [[1, 2, 3, 4], [5, 6, 7, 8, 9], [10, 11, 12, 13, 14, 15], [16, 17, 18, 19, 20, 21, 22], [23, 24, 25, 26, 27, 28], [29, 30, 31, 32, 33], [34, 35, 36, 37]]
Decryption permuted grid: [[9, 35, 7, 25], [6, 22, 3, 30, 15], [36, 23, 28, 13, 21, 8], [19, 37, 18, 31, 34, 12, 33], [26, 29, 27, 17, 11, 4], [2, 24, 1, 32, 16], [20, 10, 14, 5]]
Reverse Permuted Mapping: {9: 0, 35: 1, 7: 2, 25: 3, 6: 4, 22: 5, 3: 6, 30: 7, 15: 8, 36: 9, 23: 10, 28: 11, 13: 12, 21: 13, 8: 14, 19: 15, 37: 16, 18: 17, 31: 18, 34: 19, 12: 20, 33: 21, 26: 22, 29: 23, 27: 24, 17: 25, 11: 26, 4: 27, 2: 28, 24: 29, 1: 30, 32: 31, 16: 32, 20: 33, 10: 34, 14: 35, 5: 36}
Text after padding: []
Matrix created from text: [[97, 103, 115, 111], [99, 32, 105, 32, 84], [99, 116, 101, 115, 32, 97], [104, 112, 105, 117, 105, 115, 105], [115, 114, 115, 99, 121, 115], [114, 32, 113, 112, 32], [117, 104, 115, 110]]
Flattened matrix from encrypted text: [97, 103, 115, 111, 99, 32, 105, 32, 84, 99, 116, 101, 115, 32, 97, 104, 112, 105, 117, 105, 115, 105, 115, 114, 115, 99, 121, 115, 114, 32, 113, 112, 32, 117, 104, 115, 110]
Flat matrix converted to text: This is asssss unique cryptographic c
Decrypted text before trimming: This is asssss unique cryptographic c
Decrypted: This is asssss unique cryptographic c
Decrypted length: 37
Traceback (most recent call last):
  File "/home/zero/hpc.py", line 127, in <module>
    assert plaintext == decrypted_text, "Decryption failed"
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: Decryption failed
(venv) zero@zero:~/ (main)$ /home/zero//venv/bin/python /home/zero/hpc.py
Plaintext: This is assssss unique cryptographic cipher test!
Key for permutation: 35
Flat grid for permutation: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61]
Permuted flat grid: [15, 35, 26, 14, 40, 59, 52, 31, 61, 44, 47, 13, 30, 21, 58, 5, 20, 25, 55, 23, 12, 16, 53, 54, 27, 29, 6, 3, 11, 8, 39, 50, 51, 56, 2, 46, 32, 43, 41, 33, 1, 45, 7, 38, 24, 42, 18, 34, 57, 4, 37, 17, 28, 19, 10, 60, 48, 9, 49, 22, 36]
Original grid for encryption: [[1, 2, 3, 4, 5], [6, 7, 8, 9, 10, 11], [12, 13, 14, 15, 16, 17, 18], [19, 20, 21, 22, 23, 24, 25, 26], [27, 28, 29, 30, 31, 32, 33, 34, 35], [36, 37, 38, 39, 40, 41, 42, 43], [44, 45, 46, 47, 48, 49, 50], [51, 52, 53, 54, 55, 56], [57, 58, 59, 60, 61]]
Permuted grid for encryption: [[15, 35, 26, 14, 40], [59, 52, 31, 61, 44, 47], [13, 30, 21, 58, 5, 20, 25], [55, 23, 12, 16, 53, 54, 27, 29], [6, 3, 11, 8, 39, 50, 51, 56, 2], [46, 32, 43, 41, 33, 1, 45, 7], [38, 24, 42, 18, 34, 57, 4], [37, 17, 28, 19, 10, 60], [48, 9, 49, 22, 36]]
Text after padding: []
Matrix created from text: [[84, 104, 105, 115, 32], [105, 115, 32, 97, 115, 115], [115, 115, 115, 115, 32, 117, 110], [105, 113, 117, 101, 32, 99, 114, 121], [112, 116, 111, 103, 114, 97, 112, 104, 105], [99, 32, 99, 105, 112, 104, 101, 114], [32, 116, 101, 115, 116, 33, 32], [32, 32, 32, 32, 32, 32], [32, 32, 32, 32, 32]]
Flattened matrix for encryption: [84, 104, 105, 115, 32, 105, 115, 32, 97, 115, 115, 115, 115, 115, 115, 32, 117, 110, 105, 113, 117, 101, 32, 99, 114, 121, 112, 116, 111, 103, 114, 97, 112, 104, 105, 99, 32, 99, 105, 112, 104, 101, 114, 32, 116, 101, 115, 116, 33, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32]
Flat matrix converted to text: hit  prg  oussTe s us qtnir ys  pth   r iecsecs  aps cih!si a
Encrypted: hit  prg  oussTe s us qtnir ys  pth   r iecsecs  aps cih!si a
Encrypted length: 61
Key for permutation: 35
Flat grid for permutation: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61]
Permuted flat grid: [15, 35, 26, 14, 40, 59, 52, 31, 61, 44, 47, 13, 30, 21, 58, 5, 20, 25, 55, 23, 12, 16, 53, 54, 27, 29, 6, 3, 11, 8, 39, 50, 51, 56, 2, 46, 32, 43, 41, 33, 1, 45, 7, 38, 24, 42, 18, 34, 57, 4, 37, 17, 28, 19, 10, 60, 48, 9, 49, 22, 36]
Decryption original grid: [[1, 2, 3, 4, 5], [6, 7, 8, 9, 10, 11], [12, 13, 14, 15, 16, 17, 18], [19, 20, 21, 22, 23, 24, 25, 26], [27, 28, 29, 30, 31, 32, 33, 34, 35], [36, 37, 38, 39, 40, 41, 42, 43], [44, 45, 46, 47, 48, 49, 50], [51, 52, 53, 54, 55, 56], [57, 58, 59, 60, 61]]
Decryption permuted grid: [[15, 35, 26, 14, 40], [59, 52, 31, 61, 44, 47], [13, 30, 21, 58, 5, 20, 25], [55, 23, 12, 16, 53, 54, 27, 29], [6, 3, 11, 8, 39, 50, 51, 56, 2], [46, 32, 43, 41, 33, 1, 45, 7], [38, 24, 42, 18, 34, 57, 4], [37, 17, 28, 19, 10, 60], [48, 9, 49, 22, 36]]
Reverse Permuted Mapping: {15: 0, 35: 1, 26: 2, 14: 3, 40: 4, 59: 5, 52: 6, 31: 7, 61: 8, 44: 9, 47: 10, 13: 11, 30: 12, 21: 13, 58: 14, 5: 15, 20: 16, 25: 17, 55: 18, 23: 19, 12: 20, 16: 21, 53: 22, 54: 23, 27: 24, 29: 25, 6: 26, 3: 27, 11: 28, 8: 29, 39: 30, 50: 31, 51: 32, 56: 33, 2: 34, 46: 35, 32: 36, 43: 37, 41: 38, 33: 39, 1: 40, 45: 41, 7: 42, 38: 43, 24: 44, 42: 45, 18: 46, 34: 47, 57: 48, 4: 49, 37: 50, 17: 51, 28: 52, 19: 53, 10: 54, 60: 55, 48: 56, 9: 57, 49: 58, 22: 59, 36: 60}
Text after padding: []
Matrix created from text: [[104, 105, 116, 32, 32], [112, 114, 103, 32, 32, 111], [117, 115, 115, 84, 101, 32, 115], [32, 117, 115, 32, 113, 116, 110, 105], [114, 32, 121, 115, 32, 32, 112, 116, 104], [32, 32, 32, 114, 32, 105, 101, 99], [115, 101, 99, 115, 32, 32, 97], [112, 115, 32, 99, 105, 104], [33, 115, 105, 32, 97]]
Flattened matrix from encrypted text: [104, 105, 116, 32, 32, 112, 114, 103, 32, 32, 111, 117, 115, 115, 84, 101, 32, 115, 32, 117, 115, 32, 113, 116, 110, 105, 114, 32, 121, 115, 32, 32, 112, 116, 104, 32, 32, 32, 114, 32, 105, 101, 99, 115, 101, 99, 115, 32, 32, 97, 112, 115, 32, 99, 105, 104, 33, 115, 105, 32, 97]
Flat matrix converted to text: This is assssss unique cryptographic cipher test!
Decrypted text before trimming: This is assssss unique cryptographic cipher test!
Decrypted: This is assssss unique cryptographic cipher test!
Decrypted length: 49

Potential Root Cause
The issue likely lies within the decryption logic itself. While the permutation appears to be correctly reversed, there might be an error in how the text is extracted from the decrypted matrix or how the padding is handled.

Next Steps

1. Thorough Code Review: Review the decryption function in hpc.py to identify logical errors or incorrect assumptions related to short texts.
2. Padding Mechanism: Examine how padding is applied during encryption and removed during decryption. There could be an issue with incorrect padding removal for short inputs.
3. Edge Case Testing: Create specific test cases with very short plaintexts to isolate the problem further.