Basic kryptering
Tekst:
Krypteret tekst:
114 993 358 650 930 223 775 636 846 973 531 649 780 265 670 776 329 882 822 969 956 171 775
De-Krypteret tekst:
Brug af one-time-keypad
One-time pad
In cryptography, the one-time pad (OTP) is an encryption technique that cannot be cracked, but requires the use of a single-use pre-shared key that is larger than or equal to the size of the message being sent. In this technique, a plaintext is paired with a random secret key (also referred to as a one-time pad). Then, each bit or character of the plaintext is encrypted by combining it with the corresponding bit or character from the pad using modular addition. The resulting ciphertext will be impossible to decrypt or break if the following four conditions are met
- The key must be at least as long as the plaintext.
- The key must be truly random.
- The key must never be reused in whole or in part.
- The key must be kept completely secret by the communicating parties.
It has also been mathematically proven that any cipher with the property of perfect secrecy must use keys with effectively the same requirements as OTP keys. Digital versions of one-time pad ciphers have been used by nations for critical diplomatic and military communication, but the problems of secure key distribution make them impractical for most applications.
One-time-use-key-pad. Max 500 tegn
48 879 241 547 898 126 673 604 735 863 430 604 664 160 561 675 284 775 721 848 844 74 675 495 876 823 882 685 468 362 169 588 211 525 710 924 304 625 191 529 857 236 823 968 195 144 301 830 842 152 363 117 418 35 564 68 462 264 461 780 545 433 979 273 678 177 193 352 658 539 402 364 201 389 948 747 827 850 828 309 447 640 51 675 288 547 696 975 777 560 987 160 486 214 373 982 669 616 4 455 405 238 605 538 850 133 214 676 699 709 78 513 669 995 198 982 36 289 736 288 159 179 114 843 122 227 792 896 651 838 402 456 127 74 111 540 159 53 978 126 705 109 95 552 361 259 52 478 905 613 426 242 19 928 126 381 407 668 94 777 52 618 505 243 721 934 842 715 204 408 654 606 246 872 304 417 480 631 189 439 8 899 311 401 177 135 243 512 431 672 964 850 220 69 382 952 218 862 870 377 577 191 204 414 180 923 42 602 156 312 401 918 672 962 742 468 525 581 147 702 694 892 586 434 623 423 662 302 550 327 136 766 132 642 198 279 372 899 599 128 85 369 228 493 176 340 804 172 284 611 267 334 1 706 423 491 673 34 575 127 880 148 585 418 693 459 756 850 567 856 802 586 589 863 857 870 847 761 777 625 891 190 14 978 758 800 72 930 953 597 272 600 121 995 383 210 950 120 438 358 833 909 666 287 931 208 470 418 40 592 467 600 826 664 557 51 290 868 226 214 567 698 41 939 130 661 697 406 8 405 803 392 358 445 285 523 311 731 353 1 21 160 53 340 616 990 635 198 445 604 114 833 724 270 574 360 31 336 934 847 227 832 539 631 375 946 423 146 197 213 21 617 550 522 228 963 700 630 636 501 815 592 758 861 489 993 727 353 718 657 548 118 981 309 301 575 715 15 925 954 864 108 325 836 71 452 686 545 534 387 947 964 644 204 242 222 767 411 700 361 966 833 442 15 629 347 33 357 804 463 695 638 849 435 614 787 100 89 212 104 558 814 184 695 320 775 915 711 170 743 459 80 937 79 233 126 555 298 464 132 405 866 853 209 208 285 748 683 200 419 555 286 408 666 837 772 744 769 827 424 593 558 412 682 916 828 402 217 876 86 369 15 156 303 137 422 64 704 80 935
I kode er det relativt nemt at lave operationerne. Det er også nemt at udvide til 500+ tegn
Det store problem er udveksling af keys og at holde dem hemmelige