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Because in crypto, the math usually isn't mod 2^256. For instance in curve25519 you do do math mod 2^255-19, so they actually all fit in 51 bit.
by kroeckx 6y ago
Because in crypto, the math usually isn't mod 2^256. For instance in curve25519 you do do math mod 2^255-19, so they actually all fit in 51 bit.
- tspiteri 6y agoAh, then in that case it's actually five 51-bit limbs making up the required 255 bits. So probably the article has a slight mistake here assuming that 52 bits of the highest limb are used which led to an inaccurate reason when trying to explain why it's fine.