# How bad is it to leak \$k\$ in RSA?

In RSA using a small public exponent $$e$$ such as $$65537$$, how bad is it if the value $$k$$ leaks? $$k$$ as in the following equations:

$$ed – 1 = k phi(n)$$

or

$$ed – 1 = k cdot mathrm{lcm}(p-1,q-1)$$

Intuitively, this would only reduce the complexity of the breaking the system by $$65535$$ times, nowhere near enough to matter, though I assume that GNFS would not be improved by knowing $$k$$.

Sending ETHM to my ETH wallet address in Coinbase Wallet results in the ETHM being sent back to my ETHM wallet

Using Coinbase wallet, I sent ETHM to my ETH wallet address (ETHM is ERC20). The transaction was successful and I was charged a fee. In Coinbase Wallet I now see the ETHM back in my ETHM wallet, which was sent there from my ETH wallet address. How can I transfer the ETHM to ETH? I can do it in Uniswap, but Coinbase wallet is reflecting a much higher rate for the ETHM, so I want to do the swap there.

#### How bad is it to leak \$k\$ in RSA?

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