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Activity for Holdenâ€
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Comment | Post #292206 |
I see, the second scheme is more inefficient because one more block has to be encrypted/decrypted. (more) |
— | 4 months ago |
| Edit | Post #292205 | Initial revision | — | 4 months ago |
| Question | — |
Is this AES/CBC scheme, where the IV does not need to be known during decryption, insecure or does it have any other disadvantages? Usually a random IV is used for encryption with AES in CBC mode, so that key/IV pairs are not reused, which would be a vulnerability. During decryption, the IV of the encryption is required. If decryption is performed with a different IV, this leads to corruption of the first block in CBC mode. ... (more) |
— | 4 months ago |
| Edit | Post #286081 | Initial revision | — | almost 3 years ago |
| Answer | — |
A: How can the Caesar cipher be implemented in Java? The formulas for encryption and decryption require a positive value of the modulo operation. However, this is not guaranteed for all implementations of the modulo operator. For instance, in Python the modulo value is always positive (e.g. `-2 % 5 = 3`), while in Java it can be negative (e.g. `-2 % 5 ... (more) |
— | almost 3 years ago |
| Edit | Post #286080 | Initial revision | — | almost 3 years ago |
| Question | — |
How can the Caesar cipher be implemented in Java? The Caesar cipher is a substitution cipher in which the letters of an ordered alphabet are cyclically shifted by a given number. A detailed description can be found e.g. here. Let `u` be the index of the letter to be encrypted in the alphabet, `shift` the shift and `size` the number of letters of... (more) |
— | almost 3 years ago |