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35 bytes added ,  07:37, 11 January 2017
→‎Hardware: Correction with derivation of 6.x and 7.x keys.
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By setting the modulus to a prime number whose modular multiplicative order is "smooth" (that is, p-1 is divisible by only small prime numbers), discrete logarithms can be calculated quickly using the [[wikipedia:Pohlig-Hellman algorithm|Pohlig-Hellman algorithm]].  If the prime chosen is greater than the modulus, but the same bit size, the discrete logarithm is the private exponent.
 
By setting the modulus to a prime number whose modular multiplicative order is "smooth" (that is, p-1 is divisible by only small prime numbers), discrete logarithms can be calculated quickly using the [[wikipedia:Pohlig-Hellman algorithm|Pohlig-Hellman algorithm]].  If the prime chosen is greater than the modulus, but the same bit size, the discrete logarithm is the private exponent.
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This exploit's usefulness is limited: these four keyslots' values are only used in current firmware for deriving the 6.x save and 7.x NCCH keys, which were already known.  Additionally, with a boot ROM dump, this exploit is moot; these private keys are located in the protected ARM9 boot ROM.
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This exploit's usefulness is limited: RSA keyslot 0 is only used in current firmware for deriving the 6.x save and 7.x NCCH keys, which were already known, and the other three keyslots are entirely unused.  Additionally, with a boot ROM dump, this exploit is moot; these private keys are located in the protected ARM9 boot ROM.
 
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