# Questions tagged [rc5]

RC5 is a symmetric key block cipher designed by Ronald Rivest.

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### Rivest Cipher 6 (RC6) Key Scheduler

I am trying to understand the Key Scheduler used in RC6 and I have a total of 3 questions. The RC6 Wikipedia page says that the only difference between the RC5 and RC6 key scheduler is that more words ...
59 views

### Which is best: RC5, RC6, CAST-128, LOKI97, or MARS? [closed]

Considering speed and security, which is best: RC5, RC6, CAST-128, LOKI97, or MARS? What does the scoreboard look like? (I'm asking about the abstract math concept, not related to any code ...
55 views

### Modular Addition in RC5 is linear or not?

So, far my understanding was Modular addition is non linear function which is mainly used in ARX based ciphers. While I was glancing through RC5 paper (https://link.springer.com/content/pdf/10.1007/3-...
128 views

### Breaking RC5 without rotations

I'm trying to follow Schneier's self-study course in cryptanalysis and am ashamed to say I am stuck on the very first problem of breaking 8-round RC5 without any rotations (i.e. just XOR and modular ...
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### Difference between RC2, RC4, RC5 and RC6

Can anyone point out the core differences between RC variations?
102 views

### Why is variable rotation uncommon in cryptographic primitives?

Most cryptographic primitives I've seen rotate by a constant. RC5 did something different though: For a word size $w=2^n$, you can take the last $n$ bits of a value as a rotation amount. There's more ...